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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!
Quiz by
Quizmaster
Featured Quiz
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Last updated: September 4, 2018
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First submittedApril 25, 2017
Times taken612,975
Average score60.0%
Rating4.78
Quiz and answer stats >>
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1:15
Enter answer here:
0
 / 20 guessed
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Scoring
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This beats or equals % of test takers also scored 100%
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Keep scrolling down for answers and more stats ...
Number
Double
178
356
799
1598
737
1474
222
444
479
958
31
62
119
238
581
1162
971
1942
497
994
63
126
212
424
883
1766
457
914
520
1040
98
196
905
1810
926
1852
564
1128
829
1658
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74 Comments
Falcons11
+35
Level 24
Apr 25, 2017
cool quiz
TheGeographyGuy
+7
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!!!!!!! :(
TheGeographyGuy
+8
Level 34
Feb 24, 2019
it's out now
CapitalsIsMyGoal
+3
Level 53
Sep 12, 2024
I thought it was only about an hour or few, but then i checked the date-
TheGeographyGuy
+40
Level 34
Feb 24, 2019
it's been out for almost eleven months
Pufferfish952
+12
Level 43
Dec 22, 2019
lol it only takes like 24 four hours not 11 months
jnr
+41
Level 68
Mar 20, 2020
I like this monologue
Quizzer6794
+4
Level 66
Apr 25, 2017
I like it! A 45 second version would be a real challenge. I can only get in 50 seconds.
sacheth9
+1
Level 65
Mar 20, 2020
Yes! You're right! (:
Dollyfroggy
+4
Level 63
Aug 11, 2023
I feel like this pool is pretty dependent on what you get, though. 350 is much easier than 576.
Jor85
+2
Level 99
Jun 16, 2017
21'' left
AlphaBetaGamma
+19
Level 26
Apr 7, 2021
21 inches left?
sSubatonic
+1
Level 26
Oct 3, 2025
yes
Jor85
+2
Level 99
Jun 17, 2017
25'' left
Jor85
+1
Level 99
Jun 19, 2017
30'' left
Jor85
+1
Level 99
Jul 13, 2017
32'' left
Jor85
+1
Level 99
Jul 14, 2017
33'' left
IsleAuHaulte
+9
Level 92
Oct 21, 2018
I gonna go the whole yard. 36" left.
Caleb010401
+4
Level 25
Nov 17, 2022
Bruh I got a whole mile left; 63360”
sSubatonic
+1
Level 26
Oct 3, 2025
I got 1 light year left; 372,500,000,000,000,000"
mahble
+6
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!
Jonas818
+2
Level 26
Nov 20, 2021
Same i was on 2 seconds left. Safe to say that gave my heart a run PHEW indeed!!!
Jor85
+1
Level 99
Sep 19, 2017
36 seconds left
Pimbard6
+1
Level 66
Sep 19, 2017
Good work, everyone!

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

hasanabdi
+2
Level 70
Mar 29, 2022
waffler

unless i missed a joke

ander217
+2
Level 73
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.)
Mosestomtom
+2
Level 35
Sep 19, 2017
Got stuck on 966! damn
Dollyfroggy
+6
Level 63
Aug 11, 2023
966! doesn't even fit in this post. How could they expect you to find double of it?
Deathslayer
+1
Level 40
Jan 13, 2025
math jokes ftw!
Ampo
+2
Level 42
Sep 23, 2017
great quiz! did it in 40 seconds
Jor85
+1
Level 99
Sep 27, 2017
40'' left
identitycrisis
+1
Level 22
Mar 21, 2025
wow!
Franpuemont
+1
Level 12
Oct 2, 2017
7 seconds left!
SoaringWombat
+1
Level 50
Mar 2, 2022
snap!
JCBCFC
+1
Level 44
Nov 1, 2017
Did it with 30 seconds left
Subara
+4
Level 34
Nov 5, 2017
should be rename "quick mafs"
Froststar101
+2
Level 73
Nov 5, 2017
Two plus two is four, minus one that's three, quick mafs.
Timbenz
+1
Level 24
Nov 5, 2017
Did it with 1:15 left!

XD

JlDaBeast123
+1
Level 2
Dec 7, 2017
I got them all with 49 seconds left
Malbaby
+1
Level 70
Dec 9, 2017
Mental Arithmetic...... how good are you? try my Sum the Numbers quiz .........here it is
TheGeographyGuy
+1
Level 34
Apr 2, 2018
i got 16/20 cringe!!!
crazynbafan8
+1
Level 12
Apr 6, 2018
i did it with 29 seconds remaining
Papaya
+1
Level 47
Apr 18, 2018
Oh, the numbers change every time. Nice.
x277
+1
Level 20
May 1, 2018
great quiz. I got the last number with :01 to spare. Very good for mental Math.
ImAJetPunk
+1
Level 18
May 18, 2018
I got all of them and i'm eleven, I cheated though and did it untimed!
vinchenzo
+1
Level 14
Jul 17, 2018
30 seconds left!
JoshB04
+1
Level 25
Jul 18, 2018
im not showing this to my maths teacher haha
delpieric
+1
Level 21
Oct 1, 2018
35 seconds remaining.
Anshul
+1
Level 37
Nov 15, 2018
9 seconds left
Sifhraven
+1
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)

Raz07
+1
Level 57
May 10, 2019
31 seconds remaining
DenisFC
+1
Level 23
Sep 23, 2020
nice quiz!
turnbacktwo
+2
Level 46
Dec 10, 2020
wonder what the biggest number is that you can double. The biggest I've got was 998
Miadapup787
+1
Level 17
Jan 26, 2021
nice quiz!!!
Moo1Moo
+1
Level 32
Mar 1, 2021
wow, got them all with 1 second left
Algarve
+1
Level 70
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).

Dollyfroggy
+1
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!
MallardQuack
+5
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...

lazzari
+1
Level 30
Mar 6, 2022
ok
Kenneth3748
+1
Level 52
Mar 25, 2022
yay I did it with 35 seconds to spare
Kenneth3748
+1
Level 52
Mar 25, 2022
beat about 85% of testtakers
mathemusician
+7
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.
orange3472
+1
Level 72
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...

Quizmaster
+1
Level ∞
Jan 13, 2025
Related: Chimpanzees have superhuman photographic memory.
Matriks404
+1
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.
Quizzler14
+2
Level 66
Oct 11, 2024
Liberal arts major, 100% in 55 seconds on my first try lol
identitycrisis
+1
Level 22
Mar 21, 2025
nice!
Mukhusin
+1
Level 39
Nov 1, 2024
Great quiz!
DomsWay
+2
Level 20
Jan 13, 2025
11/20, cool.
sigmaskibidi229
+1
Level 15
Jan 13, 2025
rigged math isnt real
Matriks404
+1
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.
12345wired
+1
Level 37
Mar 29, 2025
Cool quiz!
peepers01
+1
Level 20
Jun 24, 2025
100% in 32 seconds :D
Micell03
+1
Level 40
Dec 10, 2025
67
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