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Fast Math - Square Roots

In this quiz the answers change every time you play! Solve these randomised square root problems as fast as you can!
Answer must correspond to highlighted box!
All answers are integers
Too easy? Try the harder version: Up to 200 squared
Quiz by Stewart
Rate:
Featured Quiz
Last updated: November 3, 2019
You have not attempted this quiz yet.
More quiz info >>
First submittedNovember 3, 2019
Times taken42,134
Average score70.0%
Rating4.37
Quiz and answer stats >>
Friends stats >>
2:30
Enter solution 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 ...
Problem
Solution
√625
25
√441
21
√144
12
√3136
56
√49
7
Problem
Solution
√1024
32
√81
9
√2916
54
√484
22
√900
30
Problem
Solution
√289
17
√1296
36
√121
11
√1936
44
√841
29
Problem
Solution
√1681
41
√361
19
√225
15
√256
16
√2704
52
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34 Comments
Nathaniel
+12
Level 75
Nov 10, 2019
I made a Fast Math - Roots Quiz in August, not that anyone cares.
Stewart
+22
Level 68
Nov 10, 2019
But yours wasn't randomised, and is cube roots too. This is just square roots.
JSSTyger
+2
Level 53
Nov 13, 2019
I am the damn champion. 100% first time with 8 seconds left.
rphxx
+4
Level 71
Dec 28, 2019
1:24 left
81928128
+20
Level 61
Jan 6, 2020
did it in 43s on my first try. simple trick: estimate the first digit by ignoring the last two digits and taking the square root, then guess the last digit by looking at the last digit.
Malbaby
+2
Level 70
Apr 7, 2020
Can I call you '819' for short?....... anyway you are correct with your tip, I got 19/20 having a go your way........ i don't know why it works ...... but it does!
AntiMatter8192
+1
Level 70
Apr 24, 2020
I had a similar trick, just guessed numbers using the first 3 digits and using the last digit to see if the root was odd.
benf415
+17
Level 67
Jun 23, 2020
No estimation required:

>100 means it's 10+

>400 means it's 20+

>900 means it's 30+

>1600 means it's 40+ and

>2500 means it's 50+

And the last digit:

1 means either 1 or 9

4 means 2 or 8

5 means 5

6 means 4 or 6 and

9 means 3 or 7

EcceHomo
+2
Level 82
Jul 8, 2020
ben415 nice tip, got them all using this method.
sergeantmalice
+1
Level 56
Jun 9, 2022
@benf415 you're a genius, helped me pass this
joeythelemur
+3
Level 83
Apr 10, 2020
Easy, Tyger
souhhcong
+1
Level 46
Aug 23, 2021
who

who asked

Pufferfish952
+1
Level 43
Dec 22, 2019
100% first try with 19 seconds left i could have done it faster but for somereason i got stuck on one
mf3
+22
Level 88
Apr 7, 2020
Now you'll remember that the square root of one is one.
Henceforth516
+4
Level 85
Apr 6, 2020
There's a lot of time on the clock - got 100% with a minute left and a lot of guessing. It's easy to just go in order of lower to higher and guess very quickly.
Stewart
+1
Level 68
Apr 7, 2020
The time is the same as other "fast math" quizzes. 2:30 with 20 questions! Remember if this is too easy you can always try the harder version in the description!
dianalove
+1
Level 70
Apr 6, 2020
Funny!
Abknerd7
+1
Level 48
Apr 16, 2020
1st try ma bois
Yoshimano
+1
Level 65
May 18, 2020
0:33 .. phew
MrKenny
+1
Level 67
Jun 23, 2020
1:27 remaining héhé
ftozom
+1
Level 61
Jun 30, 2020
1:54 remaining on first try
maxism
+1
Level 69
Jun 23, 2020
Wasn't expecting to be able to do this one, but did it with a lot of guesswork lol. Out of interest, anyone got any good techniques?
Dimby
+2
Level 79
Jun 23, 2020
I feel like my technique is what I remember from school. The final digit of your answer determines the final digit in the squared number. 1 -> 1, 2 -> 4, 3 -> 9, 4 -> 6, 5 -> 5, et cetera. Once you know any square ending in a 4 must have come from a 2 or a 4, you're down to only several guesses that make sense. Then you can just keep in mind that if it's under 100, the answer must be under 10. If it's under 400, under 20. Under 900, under 30. Under 1600, under 40. Under 2500, under 50. I used this method and solved it with a couple minutes remaining on my first try.
ander217
+2
Level 74
Jun 23, 2020
I'm terrible at math, but I lucked out in getting clues for answers that ranged mostly from 37 through 51, so after I worked one out it was easy to look at the last digit of the remaining clues and fill in the others based on the first answer. Then I had four really easy ones, which left me plenty of time for the few I actually strugged with. Phew!
AmyD85
+3
Level 72
Jun 23, 2020
Maybe this is why I majored in English ...
peardestroyer
+1
Level 60
Jun 27, 2020
Great quiz! Thanks for including the top bar, looks amazing this way!
kapib811
+1
Level 28
Dec 11, 2020
pajace
1ProximaCentauri
+1
Level 54
Mar 21, 2021
got them all in 42 secs
stylus
+1
Level 77
Oct 10, 2021
there could be a harder version of this quiz where the answers you've already got don't stay shown, so you can't use them to help estimate the remaining ones. would be challenging but sounds like some people in these comments would like the challenge (and before anyone suggests it, i don't have the quizmaking skills to do this myself).
BuaDencosMen
+1
Level 21
Oct 3, 2022
I did all of them in just 45sec I DID NOT CHEAT!
etfdyhw
+1
Level 24
Dec 13, 2022
done with 1:56 left. nice quiz
SorenReview
+1
Level 48
Jan 23, 2023
26 Seconds Left
potatoooooooooes
+1
Level 60
Dec 5, 2023
19
MrFatFat
+1
Level 42
Apr 22, 2024
Not horribly difficult. I took 2:20.
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