Test your mathematical intelligence (math IQ quiz)

Which number should come next in these series ? Difficulty increases after each question.
Quiz by AlbertK
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Last updated: July 21, 2016
First submittedJuly 21, 2016
Times taken1,998
Average score57.1%
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Hint
Answer
1, 2, 3, 4, 5, ?
6
3, 6, 9, 12, 15, ?
18
3, 6, 12, 24, 48, ?
96
4, 5, 7, 10, 14, ?
19
4, 6, 10, 18, 34, ?
66
8, 15, 24, 35, 48, ?
63
17, 25, 32, 37, 47, ?
58
Hint
Answer
25, 54, 83, 112, 141, ?
170
35, 24, 19, 32, 39, 28, 23, ?
36
15, 27, 42, 84, 168, ?
336
31, 71, 12, 52, 92, ?
33
59, 14, 19, 29, 40, 44, 52, 59, ?
73
43, 54, 31, 17, 22, 16, ?
14
142, 562, 586, 9016, 14201, 64562, ?
701867
+4
Level 21
Dec 10, 2018
I got 13/14 in first try!very very happy
+2
Level 46
Jul 20, 2019
expain 33 and the last one.
+2
Level 44
May 10, 2020
For 33, the easiest way to explain is switch the tens and ones places and its just adding 4. Not sure about the last one though...
+1
Level 56
Sep 18, 2020
Add 40 (31->71), subtract 59 (71->12), add 40 twice (12->52->92), subtract 59 again (92->33)
+1
Level 75
Jan 2, 2021
The way I read it was that the first digit is incremented by 4 each time; if it overflows, increment the last digit
+1
Level 39
Sep 29, 2021
Can anyone explain the second to last please? The 43, 54, 31…..
+1
Level 54
Oct 1, 2021
it is a sum of products of opposite digits of preceding and following number

43, 54 --> (4*4) + (3*5) = 31

54, 31 --> (5*1) + (4*3) = 17

31, 17 --> (3*7) + (1*1) = 22

...

22, 16 --> (2*6) + (2*1) = 14