Estimating Products of Whole Numbers and Fractions

Estimating Products of Whole Numbers and Fractions
Introduction

Estimating products helps make quick and reasonable guesses when multiplying whole numbers and fractions. It is useful when an exact answer is not nee...

A cafeteria prepares 200 glasses of fruit juice, each containing about three-fourths cup.

To make an upper estimate, we replace three-fourths of a cup with 1 cup per glass, since three-fourths is less than 1.

Multiplying 200 glasses by 1 cup gives an upper estimate of 200 cups of juice.

To find the actual amount, we multiply 2...