Assess Reasonableness Add Subtract Fractions

Match the following differences

• 3/10

• 2/3 - 1/3 =

• 0/5

• 4/5 - 4/5 =

• 1/10

• 8/10 - 7/10 =

• 1/3

• 8/9 - 4/9 =

• 4/9

• 4/10 - 1/10 =

Landon has 8/10 of his lawn left to mow. He mows 6/10 of the lawn before breaking for breakfast. How much more of the lawn does Landon have left to mow?

Kirk has 3/4 of a carton of eggs. He uses some of the eggs to make an omelette and now has 2/4 of the carton left. What fraction of the carton did Kirk use?

Review: What is 1/10 less than 5/10?

• 1/6
• 1
• 1/0
• 1/12

Marty made two types of cookies.  He used 2/3 cup of sugar for one recipe and 1/4 cup  of sugar for the other.  How much sugar did he use in all? 

• 5/12

• 3/7

• 11/12

• 1/3

Pam walks 7/8 of a mile to school.  Paul walks 1/2 of a mile to school.  How much farther does Pam walk than Paul? 

• 3/8

• 4/5

• 1 3/8

• 3/4

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators