Question

Cindy says she found a shortcut for doing multiplication problem. when she multiplies 3x24 she says 3x4is 12 or one ten and 2 ones. then there's just 2 tens left in 24, so add it up and you get. 3 tens and 2 ones. do you think Cindy's shortcut works? explain your thinking in words, and justify your response using model or partial products

Answer 1

No because 3x24=72 whereas cindy got 32. for cindy's "trick" to work, she would also have to multiply the remaining 2 tens by 3, getting a product of 60, and adding it the the previous product of 12.

Answer 2

No because you have to answer your problem correctly and then you can use your own method