Fast Math - Double That Number!

Can you double all these numbers within the time limit? Test your mental math skills!

This quiz changes every time you play!

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Last updated: September 4, 2018

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First submitted	April 25, 2017
Times taken	588,019
Average score	60.0%
Rating	4.80

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1:15

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Keep scrolling down for answers and more stats ...

Number	Double
739	1478
404	808
706	1412
80	160
574	1148

Number	Double
412	824
618	1236
214	428
910	1820
475	950

Number	Double
76	152
98	196
677	1354
275	550
429	858

Number	Double
195	390
434	868
572	1144
217	434
811	1622

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74 Comments

+34

Level 24

Apr 25, 2017

cool quiz

Level 34

Apr 2, 2018

i agree. i made my own quiz today but it is taking forever to get opened to public. sad face!!!!!!! :(

Level 34

Feb 24, 2019

it's out now

Level 53

Sep 12, 2024

I thought it was only about an hour or few, but then i checked the date-

+40

Level 34

Feb 24, 2019

it's been out for almost eleven months

+12

Level 43

Dec 22, 2019

lol it only takes like 24 four hours not 11 months

+40

Level 68

Mar 20, 2020

I like this monologue

Level 66

Apr 25, 2017

I like it! A 45 second version would be a real challenge. I can only get in 50 seconds.

Level 64

Mar 20, 2020

Yes! You're right! (:

Level 63

Aug 11, 2023

I feel like this pool is pretty dependent on what you get, though. 350 is much easier than 576.

Level 98

Jun 16, 2017

21'' left

+19

Level 26

Apr 7, 2021

21 inches left?

Level 26

Oct 3, 2025

yes

Level 98

Jun 17, 2017

25'' left

Level 98

Jun 19, 2017

30'' left

Level 98

Jul 13, 2017

32'' left

Level 98

Jul 14, 2017

33'' left

Level 92

Oct 21, 2018

I gonna go the whole yard. 36" left.

Level 25

Nov 17, 2022

Bruh I got a whole mile left; 63360”

Level 26

Oct 3, 2025

I got 1 light year left; 372,500,000,000,000,000"

Level 79

Jul 25, 2017

1 second left... I almost missed it because I mistyped 882 as 8282, so I was rapidly backspacing with about 2 seconds left and basically jammed the keyboard typing 82 again... PHEW!

Level 26

Nov 20, 2021

Same i was on 2 seconds left. Safe to say that gave my heart a run PHEW indeed!!!

Level 98

Sep 19, 2017

36 seconds left

Level 67

Sep 19, 2017

Good work, everyone!

For what it's worth, I had 46 seconds left.

Level 69

Mar 29, 2022

waffler

unless i missed a joke

Level 74

Sep 19, 2017

I'm usually terrible at math but this one was easy for me - 31 sec. left. Thank you, QM, for boosting my math self-esteem today. (Now if only I could find a way to nail those world capitals.)

Level 36

Sep 19, 2017

Got stuck on 966! damn

Level 63

Aug 11, 2023

966! doesn't even fit in this post. How could they expect you to find double of it?

Level 40

Jan 13, 2025

math jokes ftw!

Level 43

Sep 23, 2017

great quiz! did it in 40 seconds

Level 98

Sep 27, 2017

40'' left

Level 22

Mar 21, 2025

wow!

Level 12

Oct 2, 2017

7 seconds left!

Level 51

Mar 2, 2022

snap!

Level 43

Nov 1, 2017

Did it with 30 seconds left

Level 34

Nov 5, 2017

should be rename "quick mafs"

Level 73

Nov 5, 2017

Two plus two is four, minus one that's three, quick mafs.

Level 24

Nov 5, 2017

Did it with 1:15 left!

Level 2

Dec 7, 2017

I got them all with 49 seconds left

Level 70

Dec 9, 2017

Mental Arithmetic...... how good are you? try my Sum the Numbers quiz .........here it is

Level 34

Apr 2, 2018

i got 16/20 cringe!!!

Level 12

Apr 6, 2018

i did it with 29 seconds remaining

Level 47

Apr 18, 2018

Oh, the numbers change every time. Nice.

Level 20

May 1, 2018

great quiz. I got the last number with :01 to spare. Very good for mental Math.

Level 18

May 18, 2018

I got all of them and i'm eleven, I cheated though and did it untimed!

Level 15

Jul 17, 2018

30 seconds left!

Level 26

Jul 18, 2018

im not showing this to my maths teacher haha

Level 21

Oct 1, 2018

35 seconds remaining.

Level 37

Nov 15, 2018

9 seconds left

Level 76

Dec 8, 2018

Nice one! was better than I though, only missed two.

Felt more intuitive than actually doing the math after a while, but each time my answer was right, didnt have any mistakes, which surprised me actually.

Because I typed it before I was even sure it was right (inner debate, nooo dont type it yet, we arent so yet -alter ego- no just dive right in, it ll be fine)

Level 57

May 10, 2019

31 seconds remaining

Level 23

Sep 23, 2020

nice quiz!

Level 46

Dec 10, 2020

wonder what the biggest number is that you can double. The biggest I've got was 998

Level 17

Jan 26, 2021

nice quiz!!!

Level 32

Mar 1, 2021

wow, got them all with 1 second left

Level 71

Mar 1, 2022

Nice quiz, congratulations.

Just found one breach and hopefully my poor English may help me to explain it: if you select the given numbers to double, copy and paste them on a text editor (in my case, on "Notes" of iPhone), you got two columns, the left one with the numbers and right one with the answers.

I know that cheating Jetpunk is cheating yourself, I just wanted to let you know about it. Not sure if it was found already (didn't scroll down all the comment section).

Level 63

Aug 11, 2023

I'm pretty sure that only happens after the quiz. I don't have the same issue while taking the quiz. And your English is fine!

Level 53

Mar 1, 2022

Me: "Wow I got over half! I must be in the top 20 percent or something I'm so good."

This beats 40% of quiztakers.

Oh...

Level 30

Mar 6, 2022

Level 52

Mar 25, 2022

yay I did it with 35 seconds to spare

Level 52

Mar 25, 2022

beat about 85% of testtakers

Level 68

Feb 5, 2023

If this makes anyone feel better, I have a masters degree in math, I have taught math for 4 years, I can solve partial differential equations and have written countless proofs of theorems in abstract algebra, and my high score on this quiz is only 15/20 lol. Many working mathematicians aren't even that good at simple arithmetic. There are many facets to intelligence, so don't compare yourself to others.

Level 71

Jun 9, 2024

Me after taking calculus:

Can I find the integral? Yes

Can I find the deriv-? Yes

Can I solve this basic algebra problem? Well, you see...

Level ∞

Jan 13, 2025

Related: Chimpanzees have superhuman photographic memory.

Level 26

Jan 17, 2025

I got 19/20, but I wouldn't say that it has anything to do with intelligence, since you just need to remember some basic patterns when multiplying by 2. If you want to do it better, you just train a lot. It's like playing Tetris, but Tetris is much harder.

Level 64

Oct 11, 2024

Liberal arts major, 100% in 55 seconds on my first try lol

Level 22

Mar 21, 2025

nice!

Level 37

Nov 1, 2024

Great quiz!

Level 19

Jan 13, 2025

11/20, cool.

Level 15

Jan 13, 2025

rigged math isnt real

Level 26

Jan 17, 2025

I get stressed and didn't do last one, but I must say if I have done that quiz like 15 years ago, I'd do it much better, since I had weird basic arithmetic hobbies as a child, including doubling random numbers.

Level 36

Mar 29, 2025

Cool quiz!

Level 20

Jun 24, 2025

100% in 32 seconds :D

Level 19

Jul 12, 2025

Did it with 0:20 left