Reciprocals Review

To find the reciprocal

flip the fraction over

Multiple Choice

What is the reciprocal of $$\frac{7}{8}$$  ?

• 1

• $$\frac{14}{16}$$  

• $$\frac{8}{7}$$

• $$\frac{7}{8}$$

Multiple Choice

Find the reciprocal of $$\frac{7}{11}$$  

• 1 $$\frac{1}{7}$$  

• $$\frac{11}{11}$$  

• $$\frac{11}{7}$$  

• $$\frac{7}{7}$$  

Any 2 numbers with the product of 1 are called reciprocals 

(It's like turning a number upside down)

Multiple Choice

Simplify the expression: 2/5 * 5/2

• 1

• 4/5

• 2/5

Multiple Choice

Simplify the expression: 6/7 * 7/6

• 6/7

• 1

• 7/6

Multiple Choice

Simplify the expression: 8/9 * 9/8

• 8/9

• 7/8

• 1

Open Ended

What happens when you multiply a number and its reciprocal?

Reciprocal of a Whole Number

Remember

-all whole numbers can be made into fractions by putting a 1 as the denominator.

Multiple Choice

How do you find the reciprocal of a fraction?

• It's just the fraction.

• Keep it the same.

• By flipping the fraction

• There are no reciprocals.

Multiple Choice

Find the reciprocal of 11

• $$\frac{11}{1}$$

• $$\frac{11}{11}$$

• 1 $$\frac{1}{11}$$

• $$\frac{1}{11}$$

Multiple Choice

Find the reciprocal of 7

• 
  $$\frac{1}{7}$$

• $$\frac{7}{1}$$

• 1 $$\frac{1}{7}$$

• $$\frac{7}{7}$$

To find the reciprocal of a Mixed Number

you first have to make it an improper fraction, then flip.

Multiple Choice

What is the reciprocal of 3  $$\frac{2}{5}$$  

• 3 $$\frac{5}{2}$$  

• $$\frac{5}{6}$$  

• $$\frac{17}{5}$$  

• $$\frac{5}{17}$$  

Multiple Choice

If the reciprocal of a number is 1/6, what is the number?

• 36

• 1

• 12

• 6

Multiple Choice

What is the reciprocal of  $$2\ \frac{1}{4}$$  ?

• $$\frac{9}{4}$$

• $$\frac{4}{9}$$  

• $$2\ \frac{4}{1}$$  

• $$4\ \frac{1}{2}$$

Multiple Choice

Rewrite as a multiplication problem:

$$\frac{3}{4}\div2\ \frac{1}{2}$$  

Remember - multiply by the reciprocal

• $$\frac{3}{4}\times\frac{5}{2}$$  

• $$\frac{3}{4}\times\frac{2}{5}$$  

Multiple Choice

Rewrite as a multiplication problem:

$$\frac{6}{7}\div5$$  

Remember - multiply by the reciprocal

• $$\frac{6}{7}\times\frac{5}{1}$$  

• $$\frac{6}{7\ }\times\frac{1}{5}$$  

Multiple Choice

Rewrite as a multiplication problem:

$$1\frac{2}{3}\div\frac{4}{5}$$  

Remember - multiply by the reciprocal

• $$\frac{5}{3}\times\frac{5}{4}$$  

• $$\frac{5}{3\ }\times\frac{4}{5}$$