Question

Estimate the product 2 2/7 x 8 11/13 ? A) 27 B) 18 C) 16 D) 24

Answer 1

2/7 is less than 1/2 ⇒ discard

2 2/7 ≈ 2

11/13 is more than 1/2 ⇒ add 1 to the whole number

8 11/13 ≈ 9

2 2/7 x 8 11/13 ≈ 2 x 9 = 18

Answer: (B) 18

Answer 2

2 2/7 is close to 2.

8 11/13 is close to 9.

2 * 9 = 18, so my estimate is that 2 2/7 * 8 11/13 is approximately 18