Multiplying and dividing fractions

Unit 7 Review

Multiplying and dividing fractions

Estimation

Before you multiply a whole number by a unit fraction, on the next problem, you must first estimate the whole number by rounding to the nearest tens.

Multiple Choice

A zookeeper cuts bananas into sixths to feed the birds, butterflies, and monkeys at the zoo. Which of the following is the best estimate of the number of banana pieces the zookeeper will have if he cuts 453 bananas?

• 70 pieces

• 2700 pieces

• 4000 pieces

• 4500 pieces

Multiplying a whole number by a fraction

First you must multiply the numerator by the whole number then divide by the denominator.

Multiple Choice

There are 24 students in Mr. Smith's class. Three-eighths of the students in the class wear glasses. How many students wear glasses?

• 72

• 9

• 1

• 64

Division of a unit fraction by a whole number

When you divide a unit fraction by a whole number, the answer will always be a unit fraction. The numerator will always be 1 and to find the denominator, you must multiply the denominator by the whole number.

Multiple Choice

• 1/12

• 12

• 3/4

• 4/3

Division of a whole number by a fraction

When you divide a whole number by a fraction, the answer will always be a whole number. Multiply the denominator by the whole number.

Multiple Choice

Katie is knitting hats for her friends. She has 7 yards of yarn. If each hat requires 1/3 of a yard of yarn, how many hats could she make for her friends?

• 7/3

• 12

• 21

• 3/7

Order of Operations with fractions

Multiple Choice

Simplify the expression.
60 - [5-(8 x 1/4)]  $\div$  1/3

• 171

• 19

• 51

• 57