Add and Subtract Mixed Numbers Unlike Denominators

USE SCRATCH PAPER AND SOLVE THIS WORD PROBLEM: The classroom made cookies. They used 1 1/4 cups of white flour for the chocolate chip cookies. They used 2 1/3 cups of flour for peanut butter cookis. How much flour did they use in total?

• 3 2/7 cups

• 3 7/12 cups

• 1 1/12 cups

• 1 2/7 cups

• 6

• 8

• 2 4/7

• 1 2/7

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

What is the best common denominator for this problem?

• 5

• 2

• 20

• 10

• denominators.

• 4   19/5

• 4 5/10

• 4 19/25

• 4 5/10

• 4 5/10

• 4 19/25

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

Write 15/4 as a mixed number.

• 3 3/4

• 3 1/4

• 4 1/4

• 4 1/5

Solve.

• 1 1/12

• 7/12

• 3/4

• 1 1/2

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

14. A number made up of a whole number and a fraction is a _____________.

• Mixed number

• Whole number

• Fraction bar

• Reciprocal