How to Do Math In Your Head : Quick Math Tricks: Using 2 to Simplify
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@noxure Do something like that
50*67=?
5*6=30 5*7=35 delete that zero and write 335. Then multiply it by 10 coz its 50 not 5. xD
another one :
30*46=?
3*4=12 3*6=18 then youll get 1218. do this : 1(2+1)8 = 138 and + 0 its 1380
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...I noted that 67 x 3 is 201, which is very easy to multiply by any 2-digit number...and 3 is a factor of 48, thus: 48 x 67 = (67 x 3) x (48 / 3) = 201 x 16 = 3216.
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@tissa71 a lot easier is to use a caculator
altha2008 2 years ago 9
Takes too many steps.
If you do it like this:
50*67= (6700 / 2) = 3350
2*67= 134
3350 - 134 = 3216
It requires less calculations.
noxure 1 year ago 8