Question

John wanted to estimate the product of 5.2 and 6.7. What is the best estimate for his problem?

Answer 1

Round 5.2 down to 5 and Round 6.7 to 7.
5+7=12

Answer 2

The product of 5.2 and 6.7

5.2 rounds to 5
6.7 rounds to 7

so the estimate is : 5 * 7 = 35 <===
the actual is : 5.2 * 6.7 = 34.84