Fast Math - Multiplication

+11

Level 78

Oct 24, 2010

Love this!

+7

Level 33

Oct 26, 2020

impossible

+20

Level 66

Dec 12, 2020

One trick is to round up or down to an easier calculation, and then subtract or add the difference. For example, I got 98 x 6. 100 X 6 is easier, so I did that first. Because I had gone up two to get to 100, I did 6 x 2, and subtracted 12 from 600.

Of course, you could always just do 90 x 6 plus 8 x 6.

+1

Level 25

Apr 30, 2022

49 seconds left

+12

Level 30

Mar 17, 2011

100% with 1:01 to go

+3

Level 31

Dec 12, 2020

hah! 100% with 1:02 to go!

+1

Level 16

May 14, 2021

1:05 remaining = )

+11

Level 61

May 4, 2011

love this one, it really tests you unless you use a calculator obviously! 20/20

+11

Level 63

Oct 4, 2019

Why would you use a calculator?

+7

Level 54

Nov 10, 2020

to get points and the badge, obviusly.

+7

Level 67

Dec 12, 2020

If you are good at this, doing it in your head is way faster than having to type on a calculator first, and then transferring the result.

+1

Level 56

Sep 8, 2021

Yup

+6

Level 30

Jun 24, 2011

100 with 17 secs left

We should do it better

+5

Level 18

Dec 25, 2014

Ehh, managed to do all of them with 8 seconds to spare. Not too bad for a 13 year old

+95

Level 69

Nov 21, 2018

ehh managed to get them all with 30 minutes left, not too bad for someone 3 months after concepcion

+2

Level 51

Apr 16, 2020

ehh managed to get them all with 2 minutes 30 seconds left, not too bad for someone the night after conception

+19

Level 58

Apr 20, 2020

^ ruined it.

+1

Level 66

Dec 12, 2020

Especially since the time did not increase but decrease.

+4

Level 31

Aug 20, 2011

Got 17 in my head before running out of time - not bad for a first try.

+1

Level 58

Aug 26, 2011

15/20 quite pleased with that effort after a long day at work and being nearly ready for bed!

+2

Level 44

Oct 27, 2011

Got 12 doing it in my head, I work better with words than numbers

+1

Level 29

May 27, 2019

27secs remaining, did it in my head

+1

Level 60

Dec 10, 2019

1 mins+ remaining. Did it in my head.

+1

Level 31

Dec 12, 2020

same

+4

Level 66

Dec 12, 2020

I work better with words than numbers

Do you mean it is easier for you to calculate forty-five times thirteen than to calculate 45 x 13? jk

+1

Level 23

Jun 30, 2012

got all with 9 seconds to spare

+1

Level 34

Oct 13, 2012

Wow... the different times I take it are like a test to my alertness. I've gotten 20/20 several times now, but this morning, I only got 15...

+1

Level 44

Nov 25, 2012

Yeah - I'd like to see more of these... good mental exercise!

+1

Level 47

Dec 22, 2012

where are the stats for this quiz? seems strange a quiz on numbers without the stats.

+8

Level ∞

Dec 22, 2012

How can there be stats? The questions change every time.

+1

Level 58

Dec 22, 2012

Have to use all those shortcuts that they would never teach you in elementary school.

+1

Level 23

Dec 23, 2012

Wish I had a calculator.... Or was a human calculator. Got 16/20 XD!

+2

Level 59

Mar 22, 2013

20/20 with 1:28

+1

Level 29

Jul 19, 2020

20/20 with 1:48 remaining!

+1

Level 44

Apr 12, 2013

this simple multiplication is made easier by taking an indirect route to the answers that arent obvious. for example, I take 48 x 4 and see it as 50 x 4 (which i automatically know is 200) minus 2 x 4 (8) and get the answer 192 in two seconds. But if I multiply 4 by 40 and then 4 by 8 and add them together it takes 2 or 3 times as long.

+2

Level 47

May 30, 2013

Weird, I like splitting the tens and ones columns, multiplying those, and adding them back together. Your method would take longer for me. Different minds!

+1

Level 28

May 19, 2015

Yeah, just have to use those basic shortcuts that make mental maths so much easier

+1

Level 66

Aug 7, 2015

Yeah, I do that too.

+1

Level 56

Sep 8, 2021

Or you could just do 48×4. Works for me with 20/20 and 1:12 left on the clock

+1

Level 16

Apr 24, 2013

First try - 100%

+1

Level 43

Jul 28, 2013

Nailed it!! 100 % First try and 1:52 to spare. Yeah !!!

+1

Level 34

Oct 4, 2013

100% with 1:37 left.

+1

Level 40

Nov 10, 2013

Yes! Did it with 9 seconds left

+1

Level 73

Dec 2, 2013

All with :19 to go. (BTW, is there any other way to do this than in your head? Calculators sort of miss the point don't they?)

+4

Level 65

Nov 6, 2015

by hand....

+1

Level 43

Dec 17, 2013

100% With 2:10 left. Sweet!!!!

+2

Level 24

Feb 22, 2014

100% and I am in grade 4 and I know law of cosines and sines

+1

Level 77

Aug 7, 2015

Good for you. When I was in 4th grade in the early 1960s we were just learning to do long division.

+9

Level 65

Mar 23, 2016

/r/iamverysmart

+2

Level 46

Aug 21, 2018

clearly sarcasm

+1

Level 18

Mar 30, 2014

20/20 with 20 seconds left ! Wow

Who gets better?

+1

Level 73

Apr 1, 2014

20/20 with 56 left

+1

Level 63

Apr 23, 2016

20/20 with 0:57 left

+1

Level 27

Apr 29, 2016

20/20 with 1:11 left :-)

+1

Level 56

Sep 8, 2021

20/20 with 1:12 left

+1

Level 20

Jan 27, 2019

20/20 with 1:35

+1

Level 8

Apr 2, 2014

100% 1:12 left :)

+1

Level 77

Apr 30, 2014

It almost ruined my mental math skills when they allowed calculators in my high school classes! Still I got 18/20. Great quiz, by the way!

+1

Level 77

Dec 12, 2020

40 seconds left now. Seems I have recovered.

+1

Level 36

Apr 30, 2014

Like this, 100% with 45 to go.

+1

Level 55

Apr 30, 2014

Never been much good at maths :(

+1

Level 11

May 12, 2014

1:37 full marks! Still in school though

+1

Level 65

Aug 2, 2014

20/20 with 44 seconds left...not bad for a fifty-year-old who has been out of school for almost 30 years.

+1

Level 86

Aug 5, 2014

1:46 left

+1

Level 43

Aug 23, 2014

20/20, first try, with 0:41 left. Very fun!

+1

Level 63

Sep 2, 2014

with 70 seconds to spare

+1

Level 39

Sep 29, 2014

did all orally 1:07 remaining

+1

Level 18

Oct 29, 2014

36 secs left!

+1

Level 81

Nov 13, 2014

16/20 on this try. I guess it depends a bit on how many easy ones you get too. The ones I didn't have time for were: 24x18, 14x23, 33x17 and 71x8. Yes, the last one of those would've been easy, but didnt spot it when doing others.

+1

Level 56

Sep 8, 2021

that's sillie

+1

Level 16

Nov 16, 2014

Only got 17/20 first try

+1

Level 15

Nov 21, 2014

First try 26 seconds left, 100%

+1

Level 26

Nov 30, 2014

20/20 with 1:29 left. U should be able to work these out quickly.

+1

Level 26

Nov 30, 2014

Btw this was 1st try

+1

Level 81

Nov 1, 2016

Would you like a cookie?

+1

Level 55

Nov 24, 2016

hahahaha

+1

Level 50

Dec 1, 2016

im so good i was finished before i even begun.......

+1

Level 18

Dec 10, 2014

20/20 1 minute 59 first try blindfolded!

Na, just 18/20 xD still first time tough...

+1

Level 65

Dec 25, 2014

Got 100% with 36 seconds to spare, 34*17 got me for like 45 seconds though

+1

Level 29

Jan 10, 2015

All in my head 1:20!

+1

Level 29

Jan 10, 2015

And I'm 11

+2

Level 79

Apr 5, 2015

Geez kid, you want a medal?

+1

Level 77

Aug 7, 2015

I think it's great, s14103. I'd give you my math medal if I'd ever been bright enough in math to earn one.

+1

Level 23

Feb 1, 2015

50 seconds left, don't do this when you're tired, it hurts your brain.

+1

Level 77

Aug 7, 2015

So agree.

+1

Level 18

Feb 24, 2015

Finished 100% first try in 30 seconds

+1

Level 65

Mar 9, 2015

completed with 40 seconds left

+1

Level 57

Apr 27, 2015

Got all with 1:38 remaining, sounds good

+2

Level 15

May 10, 2015

Ok if anyone has trouble doing these, I have a way.

Ok say your problem is 92x4. I would take

the first ten and the last one. ( so basically the distributive property,

Ex - 90x4 ( 360 ). Then add the ones. ( 2x4 ) your answer is 368

+1

Level 8

Jun 1, 2015

With 2:10 left

+1

Level 8

Jun 1, 2015

And 2:22

+1

Level 44

Jun 22, 2015

100% with 17 seconds remaining, get really panicky at the last 30 seconds though

+1

Level 44

Aug 26, 2015

20/20 with 2:14 left on the clock ... Firts Try!! (Y)

+1

Level 63

Sep 15, 2015

20/20 with 70 secs left

+1

Level 26

Sep 25, 2015

20/20 with 1minute 17seconds remaining.

+1

Level 11

Oct 13, 2015

im not im doing perfectly well

+1

Level 68

Oct 17, 2015

4 seconds left on first try!!!!!!

+1

Level 60

Sep 10, 2017

14 numbers per second ?

+1

Level 24

Oct 27, 2015

yay 1:45 left

+1

Level 51

Oct 29, 2015

Just achieved personal best. Completed with 1:57 left.

+1

Level 20

Nov 8, 2015

First time, 32 seconds left and I'm 11

+1

Level 20

Oct 22, 2017

First time, 1:57 left and I'm 9

+1

Level 44

Nov 8, 2017

First time, 1:30 and I’m a calculator

+1

Level 66

Nov 21, 2017

First time, 1:58 left and I'm 4 months old.

+1

Level 33

Nov 10, 2017

First time, 2:00 left and I’m 5

+1

Level 61

Nov 11, 2017

0.9th try, 87 hours left and i'm -3

+1

Level 63

Nov 15, 2015

My kid just turned 1, so I guess I'd better start practising for homework help now...

+2

Level 61

Jan 2, 2016

20/20 with 34 secs remaining!

+1

Level 29

Feb 11, 2016

Anything times 11 is really simple, just separate the two numbers and add them up in the middle! Like 45 *11= 4 (4+5 =)9 and 5

+2

Level 43

Mar 13, 2017

You could multiply by 10 and then add another one. For example:

45*11=45*10+45*1=450+45=495

+1

Level 23

Mar 16, 2016

20/20 and with a minute left, can anybody beat me?

+2

Level 81

Apr 21, 2016

40/20, a whole hour left and I'm only a zygote.

+1

Level 70

Apr 26, 2016

1:57

+1

Level 27

Apr 29, 2016

1:11 left

+1

Level 13

May 3, 2016

20/20 with 1:02 left.

+1

Level 67

May 6, 2016

I may be 50 but the mental arithmetic, BOOM!

+1

Level 60

May 31, 2016

got them all with 82 seconds left without a calculator and bad a typing fast

+1

Level 68

Jun 10, 2016

How old are you?

+1

Level 29

Jun 14, 2016

20/20 1.19 left (and of course no calculator)

+1

Level 63

Jul 2, 2016

2:50 left with eyes closed

+1

Level 25

Jul 10, 2016

I was thinking of making a nerdy, big-headed remark and decided not to...

We need more people like that.

:smirk:

+1

Level 56

Jul 12, 2016

1:35 remaining :)

+1

Level 42

Aug 20, 2016

14 yrs old, all 20 correct, 2 mins 4 secs left ('-.-')

+1

Level 30

Sep 21, 2016

19/20 first try couldnt get 73x6

+1

Level 22

Nov 21, 2016

15/20. I think this is possible, but its hard af

+1

Level 51

Nov 21, 2016

100% :48 left but hard to feel good when some of them were "10*49"

+1

Level 67

Nov 23, 2016

to be fair, there should be no 2nd tries on this one!

+1

Level 88

Nov 23, 2016

20/20 first try. 1:35 left to spare.

+1

Level 55

Nov 24, 2016

nerd

+1

Level 88

Jan 21, 2018

If thats your way to recognize me for doing in 1 month, the same quantity of points that you have done in like 2 years, your comment is really welcome.

+1

Level 66

Dec 1, 2016

I'd love a cookie. Preferably Sainsburys taste the difference.

+1

Level 66

Dec 1, 2016

Why can't we upvote comments on here like reddit and imgur??!

+4

Level 67

Dec 1, 2016

20/20, 2:00 left, first try, all mental, while doing a New York Times crossword and driving a car. Just popped out of the womb last week.

+1

Level 67

Dec 2, 2016

Looks like we've got a lot of people coming in at around a minute and getting all 20. To me, that sounds like you could lop a minute off the time and still have a fun quiz, but with some time crunch.

+1

Level 27

Dec 5, 2016

Is it cheating if I also had to use paper and pen for the difficult ones??

+1

Level 63

Dec 16, 2016

Got 100% with 3 minutes and 71 seconds left

+1

Level 12

Dec 16, 2016

You serious I can't to that

+1

Level 12

Dec 16, 2016

It's so hard these mental maths give my brain a headache but anyway I got 11/20 on my first go!

+2

Level 43

Dec 25, 2016

30/30 with 8 seconds left. Did it all in my head, blind folded, hands tied behind my back and I am only 18 months old

+1

Level 41

Mar 5, 2017

Same here, but i did it with out a computer

+1

Level 71

Mar 15, 2020

20 / 20 I can believe, but 30 ...... no sorry.

+1

Level 44

Jan 29, 2017

How does it change every time?

+1

Level 45

Mar 8, 2017

Finished all of them with 2:29 left and I'm only 4 years old and have been diagnosed with severe, crippling autism. I'm also a small Indian child in Mumbai with no internet connection.

+1

Level 24

Mar 10, 2017

finished with a minute

+1

Level 25

Mar 16, 2017

Completed with 47 seconds to go

+1

Level 30

Mar 24, 2017

23 to go

+1

Level 82

Apr 6, 2017

And with that, I'm the 2000th person to earn the Math Wizard badge.

+1

Level 55

Apr 24, 2017

Woo Hoo, just got my math badge!

+1

Level 35

May 22, 2017

Very easy if you do it right. For example, for 18 x 25, do 10 x 25 + 8 x 25 = 450. Or for 52 x 8, do 50 x 8 + 2 x 8 = 416

+1

Level 24

May 24, 2017

51 seconds left!

+1

Level 28

May 26, 2017

1:18 left!!

+1

Level 70

May 28, 2017

finally did it with 29 seconds left!

+1

Level 18

Jun 1, 2017

so easy. LOL 2:30 is fast??? 20/20

+1

Level 66

Jun 8, 2017

No way this can be done calculator free.

+1

Level 71

Jun 24, 2017

What is the point of doing a quiz like this with a calculator?

+1

Level 66

Jun 15, 2017

i got 14/20 first try and im 11. Is that good or bad?

+1

Level 24

Aug 10, 2017

20/20 = 14 seconds left *phew*

+1

Level 39

Aug 18, 2017

40 seconds left on my first try while having a metaphorical brain fart.

+1

Level 70

Aug 30, 2017

First Try, 44 sec left, 57th birthday in one month - i'm feeling very very old :-)

+1

Level 67

Sep 14, 2017

I am using this quiz as a mental arithmetic practice for my students at the end of math-lessons.

+1

Level 19

Oct 6, 2017

0:36 left :)

+1

Level 42

Oct 18, 2017

1:11 left, 1:17 left

+1

Level 37

Nov 23, 2017

missed 1 :(

+1

Level 34

Dec 13, 2017

Crap! I missed the last one but I coulda got it!

+1

Level 66

Dec 19, 2017

Last one I needed for the Math Whiz badge, which has eluded me for ages. Finally got it, and with 51 seconds to spare!

+1

Level 37

Dec 24, 2017

15 is good I think !

+1

Level 54

Jan 1, 2018

Got all with 1:26 left

+1

Level 23

Jan 6, 2018

Fun quiz, but the difficulty varies a lot from time to time.

+1

Level 65

Jan 27, 2018

1:06 (first attempt)

+1

Level 39

Mar 30, 2018

Supposed To Maths

+1

Level 21

Apr 5, 2018

SORRY QUIZMASTER!!! I USED A CALCULATOR! Got it done with 1:37 to spare. I hate mental math... :(

+1

Level 46

Apr 21, 2018

50 seconds

+1

Level 50

May 23, 2018

Did the hard ones by hand and the others in my head, finished with 20 seconds left.

+1

Level 43

Jul 5, 2018

20/20 at 1:51

+1

Level 17

Aug 2, 2018

1:06 left

+1

Level 60

Aug 15, 2018

I FINALLY DID IT

+1

Level 34

Aug 31, 2018

10/20 cuz I suck at math

+1

Level 30

Sep 30, 2018

It's almost 1AM and I'm counting numbers because I'm bored. Why? I have no effin clue

+1

Level 65

Oct 1, 2018

1:10 remaining.

+1

Level 65

Dec 21, 2018

4 seconds faster this time...

+1

Level 19

Oct 29, 2018

i did them all, no calculator with 2:03 remaining

+1

Level 19

Oct 29, 2018

Also I am only 13 and in 8th grade. But currently I have higher Iq than the average adult. And typing speed helps too

+1

Level ∞

Oct 29, 2018

The average adult in the western world has an IQ of around 100, so I wouldn't brag too much about that. ;)

+1

Level 43

Oct 30, 2018

20/20 with 1:24 remaining :)

+1

Level 43

Nov 4, 2018

I redid it this time and got 1:48 :)

+1

Level 66

Nov 9, 2018

really good practice for mental math GG!

+1

Level 67

Dec 16, 2018

tough especially since I have memory issue because of my disease (often forget halfway a sentence what I was trying to say, and in the beginning i couldnt read anymore, cause after the second word I had forgotten the first. Reading got like 60% better, still cant focus at all. but math .. I allways get stuck after the first number even with the most basic stuff like 18+5 it took me several minutes sometimes, cause my mind was like a record being stuck, couldnt get past 18+....18+.....18+..... )

so extremely happy I finished this one with 100% the first go !! And actually quite surprised!

+1

Level 67

Dec 16, 2018

I guess it helps I have continued to do things that challenges your mind (as I did before) I wonder how bad my memory would ve been otherwise.

+1

Level 38

Jan 4, 2019

100% with 42 seconds left!

+1

Level 17

Jan 15, 2019

1:40 to spare :)

+1

Level 53

Jan 24, 2019

New record of 2:07 remaining!

+1

Level 53

Mar 26, 2019

Badged, awesome

+1

Level 38

Apr 12, 2019

Got 18 in my head first try... let's see if I can't get 20.

+1

Level 38

Apr 12, 2019

Ah yeah! 3rd try got all 20 in my head with 17 seconds to spare!

+1

Level 31

Apr 23, 2019

15/20 man I'm freaking stupid

+1

Level 46

Apr 27, 2019

1min43

+1

Level 58

May 25, 2019

12 year old with 35 seconds to spare

+1

Level 35

Aug 23, 2019

FINALLY, got 100%

+2

Level 51

Dec 24, 2019

Done in 51 seconds...

+1

Level 65

Apr 4, 2020

did it in 1m9s -- 12seconds of my previous best.

+1

Level 48

Apr 22, 2020

Done in a minute :)

+1

Level 35

May 6, 2020

I took this test a long time ago and after lots of attempts, I finally got 100% doing it in all in my head in August 23, 2019. Fast forward to May 6 (7) 2020 and I got 100% on my first try with 1 minute left.

+4

Level 21

May 30, 2020

not wanting to brag, but i proudly brought the average down by 1!

+1

Level 43

Aug 4, 2020

Hi, done with 10 seconds left.

+1

Level 41

Aug 12, 2020

19/20 all time used so close

+1

Level 28

Sep 2, 2020

20/20 with 2 seconds to spare... stressed me out lol

+1

Level 56

Sep 13, 2020

Dam how the average is score is 15, on 5 tries i got 14 at best.

Everybody thinking they above average looks like me is below sad sad

+2

Level 18

Feb 14, 2021

THIS QUIZ IS WAY TOO EASY

+1

Level 31

Mar 12, 2021

100% with 16 seconds left on the clock.

+1

Level 16

Mar 13, 2021

I finished it, with 56 seconds remaining!! i am 12!!

+1

Level 37

Mar 14, 2021

Too much time, should make it one minute instead

+1

Level 19

Jun 5, 2021

I completed half of it then I got to level 15 this is my first comment on a quiz and 2nd comment on JetPunk.

+2

Level 36

Jun 9, 2021

passed with 1:46 remaining, got my math wizard badge!

+1

Level 23

Jun 30, 2021

amazing quiz!

+2

Level 27

Aug 13, 2021

first try with 21 seconds left.

+1

Level 66

Aug 16, 2021

Finally got with 18 seconds left... right as I'm tired and about to go to bed.

+1

Level 29

Sep 13, 2021

Love this....1.19 left to go....do the tens first, then easy to add the single multiplier.

+1

Level 92

Nov 16, 2021

Done in 40'' (1'50'' to go).

+1

Level 25

Dec 20, 2021

Finished in 1 min, 1 sec :)

+1

Level 51

Jan 24, 2022

84x5

+1

Level 51

Jan 24, 2022

i also got 23x3

+1

Level 27

Jan 28, 2022

Not the greatest mathematician but I am trying to get all the badges (video game badge was a pain to achieve)

+1

Level 27

Jan 28, 2022

Was AFK and almost ran out of time but I came back with 2 mins left and thanks to my quick math skills (high school sucks but it's a valuable lesson) I beat it with 53 seconds left.

+1

Level 48

Feb 13, 2022

Bro beat it in 50 seconds fast math is my kind of thing

Keep up the good work!

+1

Level 17

Feb 17, 2022

1:31 left but i used a calculator :( I got mad after getting like 19/20 5 times in a row

+1

Level 26

Feb 25, 2022

it was so tempting to use the caculator

+1

Level 34

Mar 30, 2022

this is hard

+1

Level 34

May 2, 2022

This is a great exercise to revisit daily. I really like that it changes each time.

+1

Level 54

May 3, 2022

very fun brain exercise

+1

Level 44

Jun 1, 2022

20/20 without starting the quiz :)

+1

Level 31

Aug 13, 2022

1:59 left with 20/20! Abacus helps with mental arithmetic. Pleased to see I've still got it :D

First submitted	December 22, 2012
Times taken	681,151
Average score	75.0%
Rating	4.69