Dividing unit fractions

Front

What is a unit fraction?

Back

A unit fraction is a fraction that has 1 as the numerator, such as 1/2, 1/3, or 1/4.

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2A

Front

How do you divide a fraction by a whole number?

Back

To divide a fraction by a whole number, multiply the denominator of the fraction by the whole number. For example, 1/8 ÷ 6 = 1/(8*6) = 1/48.

Front

What is the result of 6 ÷ 1/5?

Back

The result is 30, because dividing by a fraction is the same as multiplying by its reciprocal: 6 ÷ 1/5 = 6 * 5/1 = 30.

Tags

CCSS.5.NF.B.7B

CCSS.5.NF.B.7C

Front

What do you call a fraction that has a numerator of 1?

Back

A fraction with a numerator of 1 is called a unit fraction.

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2A

Front

If a hamburger shop uses 1/2 box of French fries every day, how many days will 9 boxes last?

Back

9 boxes will last 18 days, because 9 ÷ (1/2) = 9 * 2 = 18.

Tags

CCSS.5.NF.B.7B

CCSS.5.NF.B.7C

Front

What is the equation to find out how many children can get a serving of grapes if there are 5 cups and each serving is 1/4 cup?

Back

The equation is 5 ÷ 1/4 = 20 children.

Tags

CCSS.5.NF.B.7B

CCSS.5.NF.B.7C

Front

What is the reciprocal of 1/4?

Back

The reciprocal of 1/4 is 4/1 or simply 4.

Front

How do you convert a division of fractions into multiplication?

Back

To convert a division of fractions into multiplication, multiply by the reciprocal of the second fraction. For example, a/b ÷ c/d = a/b * d/c.

Tags

CCSS.6.NS.A.1

Front

What is the result of 1/3 ÷ 1/6?

Back

The result is 2, because 1/3 ÷ 1/6 = 1/3 * 6/1 = 2.

Tags

CCSS.6.NS.A.1

Front

If you have 3/4 of a pizza and you want to share it equally among 3 friends, how much does each friend get?

Back

Each friend gets 1/4 of a pizza, because 3/4 ÷ 3 = 3/4 * 1/3 = 1/4.