Corina multiplied 62x22 and got a product of 1,042. explain why corina's answer is not reasonable.

If you round 62 down to 60 and 22 down to 20, it is easy to multiply them together in your head. Just multiply 6 and 2 and add two 0s. 

Knowing that 60 × 20 = 1200, we can tell that the product of 62 × 22 has to be larger, since we rounded down to get 1200.

1042 < 1200, so we know the answer is not reasonable.