Lesson Feb. 16th Dividing Unit Fractions and Whole Numbers

Lesson Feb. 16th Dividing Unit Fractions and Whole Numbers

Remember, we use the strategy Keep-Change-Flip when we divide unit fractions and whole numbers.

Keep the dividend the same. The dividend can be a unit fraction or a whole number. It is what is being divided, split, shared, cut apart, etc.

Change the division sign to a multiplication sign and solve. Remember, dividing unit fractions and whole numbers is actually multiplying by the reciprocal.

Flip the divisor by using its reciprocal. Remember, the reciprocal of a whole number is a unit fraction, 5 is 1/5. The reciprocal of a unit fraction is a whole number, 1/5 is 5.

 $5\div\frac{1}{2}=$  will become 5 x 2=10

Start with a whole number, end with a whole number.

 $\frac{1}{\ 5\ \ }\div2=$  will become  $\frac{1}{5\ }\times\ \frac{1}{2}=\frac{1}{10}\ \ \$                                                    Start with a unit fraction, end with a unit fraction 

Remember, start with a unit fraction, end with a unit fraction. Start with a whole number, end with a whole number.

Multiple Choice

Solve:

 $\frac{1}{4\ }\div8=$  

• 32

• 2

•  $\frac{1}{32}$  

•  $\frac{1}{2}$  

Multiple Choice

 $12\div\frac{1}{2}=$  

• 24

•  $\frac{1}{6}$  

•  $\frac{1}{24}$  

• 6

Multiple Choice

 $\frac{1}{10}\div10=$  

•  $\frac{1}{10}$  

• 1

• 100

•  $\frac{1}{100}$  

Multiple Choice

 $25\div\frac{1}{3}=$  

• 8

• 75

•  $\frac{1}{75}$  

• 12

Multiple Choice

 $\frac{1}{\ 9\ }\div3=$  

• 3

•  $\frac{1}{3}$  

•  $\frac{1}{27}$  

• 27

Multiple Choice

 $\frac{1}{7}\div5=$  

•  $\frac{1}{35}$  

•  $\frac{5}{7}$  

• 35

• 2

Multiple Choice

 $8\div\frac{1}{8}=$  

• 1

• 16

• 64

•  $\frac{1}{64}$  

Multiple Choice

 $\frac{1}{5}\div5=$  

• 25

•  $\frac{1}{25}$  

• 1

•  $\frac{1}{10}$  

Multiple Choice

 $4\div\frac{1}{6}=$  

• 24

•  $\frac{1}{24}$  

•  $\frac{4}{6}$  

• 10

Multiple Choice

 $15\div\frac{1}{3}=$  

• 5

•  $\frac{1}{5}$  

• 45

•  $\frac{1}{45}$