Homework Helper _ Lesson 7 Subtract Unlike

Name
Number and Operations — Fractions
5.NF.1, 5.NF.2
Lesson 7
Subtract Unlike
Fractions
eHelp
Homework Helper
1
2
Find _ - _.
5
Need help?
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10
Estimate Use benchmark fractions.
2 -_
1 ≈_
1 - =_
1
_
0
5
2
10
2
2
1
Subtract _ - _ .
5
10
Write equivalent, like fractions using the least common denominator,
2
1
LCD. The LCD of _ and _ is 10.
5
10
1
2 -_
1 = _
2× 2 -_
_
5
5× 2
10
10
4
1
=_
-_
10
Multiply.
10
4-1
3
=_
, or _
10
Write equivalent fractions using the LCD.
10
Subtract like fractions.
3
2
1
So, _ - _ = _ .
5
10
10
3
1
Check for Reasonableness Compare to your estimate. _ ≈ _
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10
2
Practice
Subtract. Write each in simplest form.
1
1
1. _ - _ =
2
4
7
1
2. _ - _ =
8
4
1
7
3. _ - _ =
12
6
Lesson 7 My Homework655
Problem Solving
4. The average rainfall in April and October for Springfield
is shown in the table below. How much more rain falls
on average in April than in October?
Average Rainfall for
Springfield
Month
Rainfall (in.)
11
_
April
16
3
_
8
October
5. Trisha helped clean up her neighborhood by picking
3
up plastic. She collected _ pound of plastic the first
4
1
day and _ pound of plastic the second day. How
6
11
6. Wyatt is hiking a trail that is _ mile long. After
12
1
hiking _ mile, he stops for water. How much farther
4
must he hike to finish the trail?
Test Practice
7. The table shows the distance each student ran
on Wednesday. How much farther did Joey run
than Steve?
A
B
1
_
mile
C
12
5
_
mile
12
D
1
_
mile
2
5
_
mile
6
656Need more practice? Download Extra Practice at
0655_0656_Gr5_S_C09L7HW_116196.indd
Student
Distance (mi)
Steve
1
_
Charlie
1
_
Joey
6
4
2
_
3
Copyright © The McGraw-Hill Companies, Inc. Bluemoon Stock/Brand X Pictures/Getty Images
much more trash did she collect the first day than the
second day?
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656
1/22/13
Program: GMH CCM
Component: SE
Vendor: Quad Graphics
Grade: 5
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