Practice
Name
12-8
Adding Mixed Numbers
In 1 through 6, find each sum. Simplify, if possible. Estimate for reasonableness.
5
2 + 8__
1. 7__
6
3
2
2. 4__
+ 2__
4
6
4
9
2
3. 11___
+ 3___
9
2
4. 7__
+ 5__
8
5
5. 5___
+ 3___
5
11 + 17___
6. 21___
10
12
10
12
8
8
12
12
7. Number Sense Write two mixed numbers that have a sum of 3.
8. What is the total
measure of an average
man’s brain and heart
in kilograms (kg)?
Vital Organ Measures
Average woman’s brain
3
1___
kg
8
2___
lb
Average man’s brain
4 kg
1___
3 lb
Average human heart
3
___
kg
10
7 lb
___
10
10
10
10
9. What is the total weight of an average
woman’s brain and heart in pounds (lb)?
10. What is the sum of the measures of an average
man’s brain and an average woman’s brain in
kilograms?
11. Which is a good comparison of the estimated
9
11
+ 2__
?
sum and the actual sum of 7__
12
12
A Estimated < actual
C Actual > estimated
B Actual = estimated
D Estimated > actual
12. Can the sum of two mixed numbers be equal to 2? Explain why or why not.
P 12•8
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