Question

write an expression that can be used to find 4 times 275 using mental math and properties of numbers.

Answer 1

(200×4) + (70×4) + (5×4)

Answer 2

Rough estimate: 4 times 300 = 1200

Properties of numbers: 4 times (300-25) = 4 times 300 - 4 times 25
= 1200 - 100
= 1100 (exact answer)