@howie_hua: How would you mentally calculate 30% of 50? #math #mathematics #maths #MentalMathMonday #stem

Howie Hua
Howie Hua
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Monday 03 November 2025 14:45:51 GMT
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stefanebttk
Stefan :
30%of50=50%of30=30/2=15
2025-11-03 14:52:55
19
mno16tik
MNO16tik :
30% of 100 is 30, half is 15
2025-11-03 14:49:15
16
amichaygy
amichaygy :
I will do 50% of 30 = 0.5*30 =15
2025-11-03 14:51:27
6
rangsk_yt
Rangsk :
I appreciate mental math Monday but can we reduce how often the "swap the percent" method is used? I think there are many uses for mental math and this one isn't all that common for me compared to other kinds.
2025-11-03 18:28:08
0
mel_the_librarian
Mel :
10% of 50 is 5x3 is 15
2025-11-04 03:06:18
1
johames.official
Johames' Messenger :
do 50 percent of 30 bc they're reversible
2025-11-04 12:55:42
1
urzukais
tiptop1987 :
30% of 100 is 30: 50 is half of 100: half of 30 is 15.
2025-11-04 16:42:15
2
romanticacademic
️ :
50/10 ×3
2025-11-03 15:03:18
2
justuskariuki
Justus Kariuki :
50% of 30...
2025-11-03 15:01:06
3
skibidiohiocum
skibidiohiocum :
3x50=300% of 50=150 150/10=15
2025-11-03 14:54:45
1
zejdd0
zzz :
x% of y is the same as y% of x
2025-11-03 15:30:26
1
mobster50
Mobster :
50% of 30 or (300% of 50) / 10
2025-11-03 14:55:38
1
jayteets4
casuwarian :
Percentages are reversible 50% of 30 is 15
2025-11-03 15:21:07
1
hekatelunasri
Heckin' Viv :
you can switch the percent with the number you multiply it by, so 50% (or half) of 30 is 15.
2025-11-03 18:50:57
1
genrefantasy
GenreFantasy :
I didn't think about it coherently, 15 just spawned in my head as soon as I saw the problem
2025-11-03 14:54:17
2
peteh61
Pete H61 :
3 × 5 = 15. Then it's just a matter of figuring out where the decimal point goes. 150 is obviously too big, 1.5 is top small. Must be 15
2025-11-04 16:01:57
1
levante_chetty
I am the star :
50%of 30 =30÷2=15
2025-11-03 14:58:31
1
ksdyh.0811
ksdyh_0811 :
50×3÷10 50÷10×3 5×3 15
2025-11-03 14:49:00
1
lokiholm
⠀ ⠀ ⠀ :
3x5=15
2025-11-03 14:49:11
5
jackofowltrades
jack :
20% is 10, 10% is 5, 10+5=15
2025-11-03 16:59:21
1
nicklurby
Nick Lurby :
3x5=50 move the decimal, 15
2025-11-04 23:27:18
0
delfontes1
Delfontes :
3*5
2025-11-06 09:46:04
0
shockop74
chaka allen :
3*5 is 15, get rid of the two zeroes to compensate for the decimal point placement on tbe .30
2025-11-04 23:50:25
0
juneau41
Juneau47 :
5x3 = 15
2025-11-03 17:16:54
0
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