Adding Fractions and Mixed Numbers

What should you do with mixed numbers when adding, subtracting, multiplying, or dividing?

• change them to improper fractions using TX

• reduce them

• flip them

• find common factors

When adding or subtracting fractions, you -

• use our 4-box method

• only add/subtract numerators & add/subtract denominators

• keep change flip

• do not need to find common 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

When I add or subtract fractions I must have _________ units.

• denominator

• numerator

• like

• unlike

• 5/12

• 6/12

• 1/12

• 4/12

What is the sum?

• 
• 
• 
• 

• 1

What is the sum of these fractions in lowest terms?

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20