Question

Estimate the product of 42 and 37.

• A. 1,200
• B. 1,600
• C. 2,000
• D. 2,500

Answer 1

The correct option is B 1,600

The general rule that we make is,
round off each factor to its greatest place, then multiply the rounded off factors.

Rounding off 42 to the nearest tens gives 40.
Rounding off 37 to the nearest tens gives 40.

Therefore, the estimated product
= 40 × 40
= 1,600