Practice!

Sample Problem

Fill the largest possible number in each blank.

(a) × 2 < 2 + 2 + 2 + 2

(b) × 5 < 5 + 5 + 5 + 5 + 5

(c) × 10 < 10 + 10 + 10 + 10

Solution

(a) 2 + 2 + 2 + 2 = 4 × 2, 3 × 2 < 4 × 2, so the largest possible number should be 3.

(b) 5 + 5 + 5 + 5 + 5 = 5 × 5, 4 × 5 < 5 × 5,so the largest possible number should be 4.

(c)10 + 10 + 10 + 10 = 4 × 10, 3 = 3 × 10 < 4 × 10,so the largest possible number should be 3.