Posted by **lizzy** on Tuesday, December 20, 2011 at 2:14pm.

In 1 through 6, find each sum. Simplify, if possible. Estimate for reasonableness.

1. 7

__2

3

+ 8

__5

6

2. 4

__3

4

+ 2

__2

5

3. 11

___9

10

+ 3

___1

20

4. 7

__6

7

+ 5

__2

7

5. 5

__8

9

+ 3

__1

2

6. 21

___ 11

12

+ 17

__2

3

7. Number Sense Write two mixed numbers that have a sum of 3.

- math -
**Steve**, Tuesday, December 20, 2011 at 3:25pm
Fractions don't format well here. Try using a/b for fractions.

I'll do #1 and yo can post your own answers for the others, which we will be happy to check.

#1.

7 2/3 + 8 5/6

One way is to add the whole numbers, then add the fractions:

7+8 + 2/3 + 5/6

15 + 2/3 + 5/6

Now, set the fractions over a common denominator:

15 + 4/6 + 5/6

15 + 9/6

Now reduce the improper fraction to a mixed number:

15 + 6/6 + 3/6

15 + 1 + 3/6

16 1/2

Another way is to make everything into fractions first:

7 2/3 + 8 5/6

21/3 + 2/3 + 48/6 + 5/6

42/6 + 4/6 + 48/6 + 5/6

99/6

96/6 + 3/6

16 1/2

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