@howie_hua: How would you mentally calculate 2×3×5×7? #math #maths #mathtok #mathematics #mentalmathmonday

Howie Hua
Howie Hua
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Monday 21 August 2023 15:50:56 GMT
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kzxb6
kzxb6 :
2x5 = 10; 3x7 = 21; 21x10 = 210
2023-08-21 16:10:10
27
matchnineohseven
Match907 :
Left to Right
2023-08-21 16:03:11
7
sander4staal
Sander:) :
Those are primes that’s fun. That’s what’s goes on in my head
2023-08-25 00:02:22
1
nick8night
Nick :
multiply the biggest ones first, 35x2x3 then the easiest 70x3 then its just 210
2023-08-21 16:00:45
4
1cantf1ndaus3r
1cantf1ndaus3r :
my exact thoughts are "10 30 7 21-0"
2023-08-22 04:22:48
1
larryrother
Larry Rother :
3*5=15 *2=30 *7=210
2023-08-21 19:46:24
1
khalil_khalil1.618
Khalil Khalil :
2×5=10 3×7=21 10×21=210
2023-08-23 08:16:38
2
brayden7803
Ryan🆘🇺🇸 :
This one was weird. 3*5=15, 2*7=14, 15*14 is one 15 less than 15^2, so 225-15=210.
2023-09-17 15:44:30
1
leticiosa
Leticia :
I looked for easy numbers and found 10x21, so 210
2023-08-22 02:35:00
1
park2837
park2837 :
5*7=35 and 2*3=6, 30*6=180 and 5*6=30, 180+30=210
2023-08-21 16:48:47
1
danibalhanibal123
Danielle Hanna :
left to right. 6, 30, 210
2023-08-24 04:52:59
1
user99841653784590
User :
2•3=6 6•7=42 42•5=21•10=210
2023-08-24 07:42:26
1
loaded_cont_e1c3v
Someone :
@Someone: 2•3•5•7. (7-2=5,3+2=5) so, (5^3)•2
2023-08-21 17:19:06
1
frostyyyyyyyyyyyyyyyyyy0
Frostyy :
2x5 3x7 10 x 21
2023-08-23 20:12:51
1
xpdqq
xpda 🏴‍☠️ :
(6x5)*7
2023-08-21 17:16:19
1
egillingham03
Erin Oesch Gillingham :
10× 21 =210
2023-09-07 21:20:48
1
kubaxrd
kubaxrd :
2*3*5*7 10*21 210
2023-08-21 17:58:07
1
gardener_antonio
Antonio :
3x7=21. 5x2=10. 10x21=210
2023-08-22 10:35:58
1
dawsonrt
dawsonrt :
5x7 = 35 35x2 =70 70x3 = 210
2023-08-22 03:02:23
1
mathgirllin
mathgirllin :
7x3=21×10=210
2023-08-22 02:56:49
1
wylliamjudd
Wylliam Judd :
6x7=42 (because of hitchhikers guide to the galaxy) 42x5=210
2023-08-22 02:53:25
1
hijmeyrpu76
Hijme :
2*3=6 6*5=30 30*7=210
2023-08-22 16:56:34
1
marvinlaesecke
Marvin Laesecke :
(2*3)*(5*7)=6*35=6*30+6*5=180+30=210
2023-08-23 07:47:08
1
patriotmomtchr
PatriotMomTchr :
5•7= 35, 35•3= 105, 105• 2= 210. Then I did 2•3= 6, 6•5= 30, 30•7= 210…. No ()’s so must be right?
2023-08-22 04:30:41
1
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