Cindy says she found a shortcut for doing multipication problems. when she multiplies 3 times 24, she says, 3 times 4 is 12 ones, or 1ten and 2 ones. then there's just 2 tens left in 24, so add it up and you get 3 tens and 2 0nes." do you think cindy's shortcut works? explain your thinking in words to justify your response using a model or partial prouducts.

Question

Mathematics

Heather Gilbert

9 November, 13:18

Cindy says she found a shortcut for doing multipication problems. when she multiplies 3 times 24, she says, 3 times 4 is 12 ones, or 1ten and 2 ones. then there's just 2 tens left in 24, so add it up and you get 3 tens and 2 0nes." do you think cindy's shortcut works? explain your thinking in words to justify your response using a model or partial prouducts.

+3

Answers (2)

Know the Answer?

Josephine Valencia · Answer 1

Yes she would be right and that is a smart short cut

Rhys Ellis · Answer 2

No because 3 times 24 actually equals 72

she forgot to multiply the 2 tens by 3

if she would've done that the answer would be 7 tens and 2 ones

:-)