@polymathematic: Reply to @startertomtom sure! You have to adjust for a carry, but it’ll still work. #multiply #mathtrick #mentalmath #numbersense #mathtricktok

Tim Ricchuiti
Tim Ricchuiti
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Region: US
Wednesday 05 January 2022 23:24:40 GMT
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outfled
Outfled :
so whats the lowest number it works with
2022-01-05 23:59:56
1
rootjepootje
RootjePootje :
This is very interesting and beyond my understanding…
2022-01-05 23:41:51
18
mista_potta
Mista Potta :
Algebra happened. (100-x)(100-y)=10000-100x-100y+xy by FOIL
2022-01-05 23:57:36
12
jonytones
Jony :
what the hell just happened?
2022-01-05 23:49:02
7
anthonysorendino5
Anthony Sorendino :
Ima go with 6464 anyway
2022-01-06 14:57:23
5
anthonysorendino5
Anthony Sorendino :
8X8= 64, and 8X8= 64. So 6464. Use the tens place and you have two 80s, so 280. Add 1000 because it’s a 4 digit answer. 7744!
2022-01-06 15:01:22
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