Homework Helper Practice _ Lesson 9

Name
Number and Operations — Fractions
5.NF.2
Lesson 9
Estimate Sums
and Differences
eHelp
Homework Helper
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5
1
Estimate 3_ - 1_ .
8
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8
Round each mixed number to the nearest whole number.
_1 is less than _1 .
2
8
1
_
So, 1 rounds down to 1.
_5 is greater than _1 .
2
8
5
_
So, 3 rounds up to 4.
8
8
5
1
3_ - 1_ ≈ 4 - 1
8
8
≈3
5
1
So, 3_ - 1_ is about 3.
8
8
Practice
Estimate by rounding each mixed number to the nearest
whole number.
1
4
1. 2_ + 6_
5
1
2. 6_ - 2_
3
1
4. 7_ - 5_
5.
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5
6
5
4
12
12
11 + _
1
_
6
18
10
8
1
3. 11_ + 4_
9
3
5
1
6. 15_ - 2_
3
8
Lesson 9 My Homework667
Problem Solving
For Exercises 7–9, use the pictures shown.
9
14 16 ft
1
8 4 ft
13
1116 ft
7. About how much taller is the birdhouse than the
swing set? Round each mixed number to the
nearest whole number.
8. About how much taller is the birdhouse than the tree
house? Round each mixed number to the nearest
whole number.
1
9.
Plan Your Solution Find the
Test Practice
10. Use the table at the right. About how many hours
did Frank ride his bike altogether?
Biking Time
Week
Length (h)
A
4 hours
C
6 hours
1
3_
B
5 hours
D
7 hours
2
_
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1
4
5
2
6
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approximate height difference between the birdhouse
and the tree house. Is it greater than or less than the
approximate difference in height between the swing
set and the tree house? Round each mixed number to
the nearest whole number.