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Fast Math - Subtraction Quiz

Try to beat the clock by answering these randomly-generated subtraction problems in your head.
This quiz changes every time you play!
Quiz by
Photop
Featured Quiz
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Last updated: April 12, 2023
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More quiz info >>
First submittedSeptember 15, 2017
Times taken63,857
Average score95.0%
Rating4.57
Quiz and answer stats >>
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2:00
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Keep scrolling down for answers and more stats ...
Problem
Answer
79 - 52
27
91 - 70
21
76 - 67
9
33 - 27
6
23 - 12
11
80 - 49
31
62 - 31
31
Problem
Answer
38 - 9
29
99 - 31
68
82 - 55
27
24 - 15
9
95 - 71
24
79 - 47
32
45 - 43
2
Problem
Answer
6 - 3
3
10 - 5
5
49 - 5
44
38 - 22
16
13 - 9
4
81 - 26
55
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29 Comments
Quizmaster
+10
Level ∞
Apr 12, 2023
Sorry for the few dozen people who took this quiz right after it was featured and had problems. Unfortunately, I've had to reset the stats for technical reasons. It should all work correctly now.
cathlete
+3
Level 78
Apr 12, 2023
Thanks for fixing it!
KiloNova
+1
Level 59
May 26, 2023
You should shorten it by a minute or two, anybody can do this.
Neodymium
+1
Level 63
Apr 12, 2023
Thank you for fixing it!
KiloNova
+1
Level 59
May 26, 2023
shorten the time by a minute or two.
WT2008
+57
Level 77
Apr 12, 2023
that's a lot of time for a "fast" math quiz
Dimby
+5
Level 83
Apr 12, 2023
Agreed. I took my time, and it still only took 43 seconds.
courthousedoc
+2
Level 79
Apr 12, 2023
Agreed. I took my time, mistyped a few times, messed up a couple of times and still only took 48 seconds. Way too much time.
ItzIngenious
+1
Level 66
Apr 12, 2023
Agreed. I took my time, and yet I still only used 48 seconds.
Dollyfroggy
+1
Level 63
May 12, 2023
Exact same time here!
sumguy
+9
Level 87
Apr 12, 2023
I'd say 1 minute too long.
comjag
+4
Level 92
Apr 12, 2023
Agree, I had over a minute left and I wasn't going too hard.
Dollyfroggy
+2
Level 63
May 12, 2023
I'd say 2 minutes too long.
Neodymium
+5
Level 63
Apr 12, 2023
Due to the resets it's the 3rd time I'm taking this..
mrzli86
+1
Level 99
Apr 12, 2023
good easy quiz
DonTheLamplighter
+10
Level 87
Apr 12, 2023
5 points for everybody!

Addition by subtraction.

Tomasmental
+2
Level 95
Apr 13, 2023
I made it using only 50 seconds, and I think I was pretty slow today.
Ilovejetpunk2
+6
Level 23
Apr 25, 2023
I think you should lower the time a bit
Aoto327
+1
Level 86
May 11, 2023
Agreed.
nick270502
+1
Level 57
May 11, 2023
definitely too much time... brain not work properly but only use minute
KiloNova
+1
Level 59
May 26, 2023
honestly how are yall on that high of a level or am I just not nerdy enough?
JackintheBox
+1
Level 82
May 13, 2023
Finished in 32 secs!
TimesKnewRoman
+1
Level 38
Dec 3, 2023
Must try to beat you bro
TimesKnewRoman
+1
Level 38
Dec 3, 2023
I assume that's impossible for me.
Photop
+2
Level 73
May 14, 2023
I agree that there is too much time, with the title being "Fast math". Will a change of the time also trigger a reset of the quiz???
Fifi567
+1
Level 32
Nov 9, 2024
No. Only changes in the answers will reset quizzes.
AwesomePotato
+2
Level 24
Oct 27, 2023
This quiz was delectable! Utter brilliance by the creator. My gratitude
SpartanLlama
+2
Level 78
May 18, 2025
A lot easier than I thought it was gonna be, guess I'm used to dreading the multiplication ones
Dontforget
+2
Level 76
May 27, 2025
Everyone talking about how there's way too much time meanwhile it took me about 7 tries before I got through all of them :( it wasn't hard I just can’t do it fast
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