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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

Last updated: September 04, 2018

Rate:

1:15

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Number	Double
-	x
-	x
-	x
-	x
-	x

Number	Double
-	x
-	x
-	x
-	x
-	x

Number	Double
-	x
-	x
-	x
-	x
-	x

Number	Double
-	x
-	x
-	x
-	x
-	x

Falcons11

level 28

Apr 25, 2017

cool quiz

GeoGenius656

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!!!!!!! :(

GeoGenius656

level 34

Feb 24, 2019

it's out now

GeoGenius656

level 34

Feb 24, 2019

it's been out for almost eleven months

Quizzer6794

level 57

Apr 25, 2017

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

sf49ers

level 79

Apr 25, 2017

perhaps there is a way to hide the quiz before you push the start button. One could easily get all the answers prepared before starting and make this exceptionally easy.

DannyWozza

+18

level 84

Apr 26, 2017

People can do that on any quiz - prepare answers before starting it. If people want to cheat that way, leave them to it. It has no bearing on my enjoyment of this site and not sure why you are bothered about how others may or may not do these quizzes. I (and I assume you do given your comment) simply open a quiz and start it straight away without checking the questions as I like to test my knowledge first then gain knowledge when I see the answers I did not know. I wouldn't be surprised if I'd gained more knowledge in my few months on this site than I did from school :)

mahble

level 64

Sep 19, 2017

Ditto. I feel like I know even more now then I did before I created this account :)

Insaniot

level 45

Feb 26, 2018

Yeah. Before I hardly knew any countries, and now I know a large portion of them, and it’s the same with states.

roddyrockstar

level 63

Jul 25, 2017

I like the idea of only having the next question appear after the previous has been answered

catlover2496

level 39

Sep 30, 2017

IneedasHower

level 33

Nov 10, 2017

OK. Maybe this comment has the most replies.

Timbenz

level 28

Apr 2, 2018

No I don’t agree because I like to do the easier ones first not be forced to do them in order.

Sifhraven

level 46

Dec 8, 2018

I agree with timbenz, what if you dont know the say the 2nd answer, but would have know all the other ones. (then it would seem for instance if you only knew 1/100 instead of 99/100 It just wouldnt work imo.

Timbenz

level 28

Apr 2, 2018

You could do that with any quiz. The point of this quiz site is to increase your knowledge, not to ace every quiz with the help of Google.

Sifhraven

level 46

Dec 8, 2018

yea I allways deliberately dont look at the quest. But have wondered many times if others do or dont, very curious to know that. I think it is probably mixed ( leaning more to the "do-look first" side, if the competitive comments is anything to go by...)

Lavoie

level 34

Jun 8, 2017

14/20

Jor85

level 77

Jun 16, 2017

21'' left

Jor85

level 77

Jun 17, 2017

25'' left

Jor85

level 77

Jun 19, 2017

30'' left

Jor85

level 77

Jul 13, 2017

32'' left

Jor85

level 77

Jul 14, 2017

33'' left

someone2018

level 67

Oct 21, 2018

I gonna go the whole yard. 36" left.

mahble

level 64

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!

Isuckatquizzes

level 33

Aug 12, 2017

Noo! I was 2 seconds left, my last question being 665 *2... 1 3, 1 second... 3 time's up!

Jor85

level 77

Sep 19, 2017

36 seconds left

Pimbard6

level 74

Sep 19, 2017

Good work, everyone! For what it's worth, I had 46 seconds left.

ander217

level 75

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

level 39

Sep 19, 2017

Got stuck on 966! damn

Ampo

level 44

Sep 23, 2017

great quiz! did it in 40 seconds

Jor85

level 77

Sep 27, 2017

40'' left

Franpuemont

level 13

Oct 2, 2017

7 seconds left!

JCBCFC

level 43

Nov 1, 2017

Did it with 30 seconds left

Subara

level 36

Nov 5, 2017

should be rename "quick mafs"

Froststar101

level 58

Nov 5, 2017

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

Timbenz

level 28

Nov 5, 2017

Did it with 1:15 left! XD

JlDaBeast123

level 2

Dec 7, 2017

I got them all with 49 seconds left

Malbaby

level 67

Dec 9, 2017

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

GeoGenius656

level 34

Apr 2, 2018

i got 16/20 cringe!!!

crazynbafan8

level 15

Apr 6, 2018

i did it with 29 seconds remaining

Papaya

level 40

Apr 18, 2018

Oh, the numbers change every time. Nice.

x277

level 22

May 1, 2018

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

ImAJetPunk

level 18

May 18, 2018

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

vinchenzo

level 17

Jul 17, 2018

30 seconds left!

JoshB04

level 16

Jul 18, 2018

im not showing this to my maths teacher haha

delpieric

level 25

Oct 1, 2018

35 seconds remaining.

Anshul

level 40

Nov 15, 2018

9 seconds left

Sifhraven

level 46

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)