Asked by Anonymous
How do you multiply 12 times 13 step by step step
Answers
Answered by
Damon
There are lots of different ways.
perhaps the easiest to understand uses the distributive property
12 = 10 + 2
13 = 10 + 3
(10 + 2) (10 + 3)
= 10 (10+3) + 2 (10+3)
= 100 + 30 + 20 + 6
= 100 + 50 + 6
= 156
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You can shorten that by saying
10(13) + 2(13)
= 130 + 26
= 156
perhaps the easiest to understand uses the distributive property
12 = 10 + 2
13 = 10 + 3
(10 + 2) (10 + 3)
= 10 (10+3) + 2 (10+3)
= 100 + 30 + 20 + 6
= 100 + 50 + 6
= 156
==========================
You can shorten that by saying
10(13) + 2(13)
= 130 + 26
= 156
Answered by
Writeacher
Another way (watch the video, then try it with your numbers):
http://www.khanacademy.org/math/arithmetic-home/multiply-divide/multi-digit-mult/v/multiplying-whole-numbers-and-applications-2
http://www.khanacademy.org/math/arithmetic-home/multiply-divide/multi-digit-mult/v/multiplying-whole-numbers-and-applications-2