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Subtract a Mixed Number from a Mixed Number

Videos, examples and solutions to help Grade 4 students learn how to subtract a mixed number from a mixed number.
Topic F: Addition and Subtraction of Fractions by Decomposition
Common Core Standards: 4.NF.3c, 4.NF.3d, 4.MD.4, 4.MD.2



 
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Common Core For Grade 4

NYS Common Core Grade 4 Module 5, Lesson 33


Lesson 33 Concept Development

Problem 1: Subtract a mixed number from a mixed number by counting up.

Problem 2: Subtract a mixed number from a mixed number when there are not enough fractional units by first subtracting the whole numbers and then decomposing the subtrahend.

Problem 3: Subtract a mixed number from a mixed number when there are not enough fractional units by decomposing a whole into fractional parts.
Lesson 33 Homework

1. Write a related addition sentence. Subtract by counting on. Use a number line or the arrow way to help.
a. 5 2/5 - 1 4/5
b. 5 3/8 - 2 5/8

2. Subtract, as shown in Problem 2(a) below, by decomposing the fractional part of the number you are subtracting. Use a number line or the arrow way to help you.
a. 4 1/5 - 1 3/5
b. 4 1/7 - 2 4/7
c. 5 5/12 - 3 8/12

3. Subtract, as shown in 3(a) below, by decomposing to take one out.
a. 5 5/8 - 2 7/8
b. 4 3/12 - 3 8/12
c. 9 1/10 - 6 9/10

4. Solve using any strategy.
a. 6 1/9 - 4 3/9
b. 5 3/10 - 3 6/10
c. 8 7/10 - 5 9/12
d. 7 4/100 - 2 92/100



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