Question

Catalina multiplied 842 and 3 and got 3,326. how can can she check to see if her answer is reasonable

Answer 1

By rounding 842 to 800, she can multiply 800 by 3 to get 2,400.

then, multiply 40 by 3, you get 120 and add the two together to get 2,520

this shows her answer is not necessary reasonable