Why did the students do multiplication problems on the floor

Cindy says she found a shortcut for doing multiplication problems. When she multiples 3 x 24,she says,’

“3×4 is 12,or,1 ten and 2 one.” 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 shortcut works?

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