Videos to help Grade 4 students learn how solve word problems involving addition and subtraction of
fractions.

Common Core Standards: 4.NF.3a,
4.NF.3d,
4.NF.1,
4.MD.2

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Lessons for Grade 4

Common Core For Grade 4

Lesson 19 Concept Development

Problem 4: Use the RDW process to solve a word problem involving the subtraction of fractions.

Mrs. Jones had 1 4/8 pizzas left after a party. After giving some to Gary, she had 7/8 pizza left. What fraction of a pizza did she give Gary?

One way is to rewrite the mixed number as 12/8 and subtract. The other method subtracts from the whole and adds back the fractional part.

Use the RDW process to solve.

1. Sue ran 9/10 mile on Monday and 7/10 mile on Tuesday. How many miles did Sue run in the 2 days?

2. Mr. Salazar cut his son’s birthday cake into equal pieces. Mr. Salazar, Mrs. Salazar, and the birthday boy each ate 1 piece of cake. What fraction of the cake was left?

3. Maria spent 4/7 of her money on a book and saved the rest. What fraction of her money did Maria save?

4. Mrs. Jones had 1 4/8 pizzas left after a party. After giving some to Gary, she had 7/8 pizza left? What fraction of a pizza did she give Gary?

5. A baker had 2 pans of corn bread. He served 1 1/4 pans. What fraction of a pan was left?

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway widget below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.