# Subtract Fractions - Unlike Units

Videos, examples, and solutions to help Grade 5 students learn how to subtract fractions with unlike units using the strategy of creating equivalent fractions.

Common Core Standards: 5.NF.1, 5.NF.2
New York State Common Core Math Grade 5, Module 3, Lesson 5

The following figures show how to subtract unlike fractions with area models. Scroll down the page for more examples and solutions. Lesson 5 Application Problem
A farmer uses 3/4 of his field to plant corn, 1/6 of his field to plant beans , and the rest to plant wheat. What fraction of his field is used for wheat?

Lesson 5 Concept Development
Problem 1: 1/2 - 1/3
Problem 2: 1/3 - 1/4
Problem 3: 1/2 - 1/5
Problem 4: 2/3 - 1/4
Problem 5: 1/2 - 2/7
Problem 6: 4/5 - 2/3

Lesson 5 Problem Set
Subtract fractions with unlike units using the strategy of creating equivalent fractions.

1. For the following problems, draw a picture using the rectangular fraction model and write the answer. Simplify your answer.
a) 1/3 - 1/4
b) 2/3 - 1/2
e) 3/4 - 3/8

Homework:
4) Katrina needs 3/5 kilogram of flour for a recipe. Her mother has 3/7 kilogram in her pantry. Is this enough flour to make the recipe If not, how much more will she need?

Lesson 5 Homework
This video shows how to subtract fractions with unlike denominators using block style diagrams.

1. The picture shows 3/4 of the square shaded. Use the picture to show how to create a fraction equivalent to 3/4 with units that would allow you to subtract 1/3, and then find the difference.
2. Find the difference. Use a rectangular fraction model to show how to convert to fractions with common denominators. a) 5/6 - 1/3

Lesson 5 Homework
2) Find the difference. Use a rectangular fraction model to show how to convert to fractions with common denominators.
a) 5/6 - 1/3
f) 5/7 - 2/3
Robin used 1/4 pound of butter to make a cake. Afterward she had 5/8 of a pound left. How much butter did she have at first?
4) Katrina needs 3/5 kilogram of flour for a recipe. Her mother has 3/7 kilogram in her pantry. Is this enough flour to make the recipe If not, how much more will she need?

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. 