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T O P I C    R E V I E W
ever22 Posted - 05/12/2012 : 16:43:37
Does anyone know any mathematical tricks for multiplying two digit number by three digit number mentally
1   L A T E S T    R E P L I E S    (Newest First)
Tessa Posted - 06/03/2012 : 05:10:34
hello ever22! I hope that this might help you!
Multiply right-most digits of both the numbers and write down the ones; carry, if any.
(e.g smiley face for where you're meant to multiply)
??
x?
Multiply the:
right digit of 2nd number with middle digit of 1st number.
left digit of 2nd number with right digit of 1st number.
Add both the results together plus carried digit; write down the ones and carry.
Multiply the
right digit of 2nd number with left digit of 1st number.
left digit of 2nd number with middle digit of 1st number.
Add the results together plus carried digit; write down the ones and carry.
Multiply left-most digits of both the numbers and add carried digit; write it down.
Good luck! I'm sorry if it is a little confusing! I would put in pictures to help if I could but....

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