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Answer
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Some
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of
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you
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who
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have
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small
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children
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may
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have
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perhaps
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been
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put
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in
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the
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embarrassing
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position
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of
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being
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unable
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to
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do
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your
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child's
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arithmetic
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homework
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because
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of
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the
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current
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revolution
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in
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mathematics
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teaching
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known
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as
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the
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New
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Math
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So
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as
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a
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public
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service
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here
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tonight
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I
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thought
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I
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would
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offer
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a
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brief
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Answer
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lesson
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in
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the
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New
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Math
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tonight
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We're
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gonna
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cover
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subtraction
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This
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is
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the
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first
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room
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I've
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worked
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for
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a
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while
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that
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didn't
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have
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a
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blackboard
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so
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we
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will
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have
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to
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make
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do
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with
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more
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primitive
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visual
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aids
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as
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they
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say
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in
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the
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ed
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biz
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Consider
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the
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following
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subtraction
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problem
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which
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I
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will
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Answer
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put
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up
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here
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342
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minus
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173
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Now
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remember
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how
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we
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used
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to
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do
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that
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three
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from
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two
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is
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nine
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carry
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the
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one
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and
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if
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you're
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under
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35
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or
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went
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to
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a
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private
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school
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you
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say
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seven
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from
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three
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is
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six
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but
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if
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you're
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over
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35
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and
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went
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to
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a
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public
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school
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you
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Answer
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say
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eight
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from
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four
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is
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six
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and
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carry
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the
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one
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so
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we
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have
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169
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but
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in
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the
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new
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approach
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as
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you
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know
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the
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important
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thing
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is
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to
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understand
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what
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you're
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doing
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rather
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than
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to
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get
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the
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right
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answer
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Here's
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how
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they
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do
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it
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now
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You
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can't
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take
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three
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from
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two
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two
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is
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Answer
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less
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than
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three
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so
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you
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look
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at
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the
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four
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in
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the
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tens
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place
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Now
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that's
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really
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four
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tens
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so
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you
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make
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it
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three
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tens
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regroup
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and
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you
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change
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a
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ten
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to
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ten
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ones
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and
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you
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add
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to
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the
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two
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and
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get
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twelve
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and
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you
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take
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away
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three
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that's
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nine
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is
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that
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clear
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Answer
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Now
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instead
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of
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four
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in
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the
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tens
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place
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You've
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got
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three
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'cause
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you
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added
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one
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That
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is
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to
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say
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ten
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to
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the
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two
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But
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you
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can't
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take
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seven
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from
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three
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so
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you
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look
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in
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the
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hundreds
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|
place
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From
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the
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three
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you
|
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then
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use
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one
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to
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make
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ten
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|
ones
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and
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you
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know
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Answer
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|
why
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four
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plus
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minus
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one
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|
plus
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|
ten
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is
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fourteen
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minus
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one
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'cause
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|
addition
|
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is
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commutative
|
|
right
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And
|
|
so
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you've
|
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got
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thirteen
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|
tens
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and
|
|
you
|
|
take
|
|
away
|
|
seven
|
|
that
|
|
leaves
|
|
five
|
|
Well
|
|
six
|
|
actually
|
|
but
|
|
the
|
|
idea
|
|
is
|
|
the
|
|
important
|
|
thing
|
|
Now
|
|
go
|
|
back
|
|
to
|
|
the
|
|
hundreds
|
|
place
|
|
You're
|
|
left
|
|
with
|
|
two
|
|
|
Answer
|
|
and
|
|
you
|
|
take
|
|
away
|
|
one
|
|
from
|
|
two
|
|
and
|
|
that
|
|
leaves
|
|
Everybody
|
|
get
|
|
one
|
|
Not
|
|
bad
|
|
for
|
|
the
|
|
first
|
|
day
|
|
Hooray
|
|
for
|
|
New
|
|
Math
|
|
New
|
|
hoo
|
|
hoo
|
|
Math
|
|
It
|
|
won't
|
|
do
|
|
you
|
|
a
|
|
bit
|
|
of
|
|
good
|
|
to
|
|
review
|
|
math
|
|
It's
|
|
so
|
|
simple
|
|
So
|
|
very
|
|
simple
|
|
That
|
|
only
|
|
a
|
|
child
|
|
can
|
|
do
|
|
it
|
|