Homework Helper _ Lesson 12 Subtract Mixed

Name
Number and Operations – Fractions
5.NF.1, 5.NF.2
Lesson 12
Subtract Mixed
Numbers
eHelp
Homework Helper
1
1
Find 8_ - 3_ .
2
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6
Estimate 9 - 3 = 6
1× 3
1
8_ = 8 _
×
1
Write an equivalent fraction for 8_ so that the
2
2
2
3
8_
3
6
fractions have the same denominator. The LCD is 6.
Subtract the wholes. Then subtract the fractions.
Subtract the wholes.
8-3=5
Subtract the fractions.
3 -_
1 =_
2
1
_
or _
1
1
2
1
So, 8_ - 3_ = 5_ or 5_ .
2
6
6
3
6
6
6
8_
1
2
1
- 3_
6
8_
3
6
1
- 3_
6
2
1
5_ or 5_
3
6
3
1
Check for Reasonableness 6 ≈ 5_
3
Practice
Estimate, then subtract. Write each difference in simplest form.
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1.
6_
5
8
_
- 23
8
2.
9_
3
4
_
- 11
3
3.
4_
5
6
_
- 41
3
Lesson 12 My Homework687
Problem Solving
5
4. Mrs. Gabel bought 7_ gallons of punch for the class
6
1
party. The students drank 4_ gallons of punch.
2
How much punch was left at the end of the party?
Write in simplest form.
5. Bella is 10 _ years old. Franco is 12_ years old.
5
12
7
12
What is the difference in their ages? Write in
simplest form.
6. In one week, the fifth grade class recycled 9 _ pounds
2
3
of glass and 12_ pounds of newspaper. How many
3
4
more pounds of newspaper than glass did the
class recycle?
2
7.
Mix iit up!
Use Number Sense A snack mix
recipe calls for 5_ cups of cereal and 3_ cups less of
3
4
5
12
Test Practice
8. What is the difference between the two weights?
3
1
A _ ounce
C 1_ ounces
B
2
7
_
ounce
8
D
4_ oz
1
2
8
7
1_ ounces
8
688Need more practice? Download Extra Practice at
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3_ oz
1
8
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raisins. How many cups of raisins are needed? Write
in simplest form.