+/- with Like Denominators
+/- with Unlike Denominators
Adding Mixed Numbers with Unlike Denominators
Subtracting Mixed Numbers with Unlike Denominators
Benchmarks & More Subtraction
Vocabulary for Working with Fractions
100
1/6 + 4/6
5/6
100
1/4 + 5/8
7/8
100
4 1/6 + 9 2/3
13 5/6
100
7 3/4 - 1 1/12
6 2/3
100

Add using Benchmark Fractions"

1/4 + 7/9

1

100

Answers must be ___________. (Hint: This is the last step you should always complete when working with fractions.)

Simplified

200
3/4 - 1/4
1/2
200
2/5 + 1/2
9/10
200

8 1/4 + 8 5/6

17 1/12

200
11 1/2- 7 3/8
4 1/8
200

Subtract using Benchmark Fractions

8/15 - 1/5

1/2

200
12/7 is an example of an _______________. This is not in the simplest form!
improper fraction
300
9/10 - 7/10
1/5
300
7/12 - 1/2
1/12
300

8 4/6 + 4 3/5

13 4/15

300

17  -  8 2/3

8 1/3

300

Add using Benchmark Fractions

1 3/9 + 2 1/8

3 1/2

300

Fractions must have the same _________ before adding or subtracting. (Hint: This is the 1st step when adding or subtracting fractions)

denominator

400

2 + 4/12

2 1/3

400
5/6 - 2/12
3/4
400

8 7/9 + 2 2/3

11 12/27

400
7 4/5 - 2 9/10
4 9/10
400
Subtract using Benchmark Fractions

9 1/8 - 4 5/6

4

400

Use __________ fractions after finding the LCM or common denominator before adding or subtracting. (Hint: This is the 2nd step when adding or subtracting fractions)

equivalent

500
1 - 1/8

7/8

500
3/12 - 1/8
1/8
500

10 5/6 + 8 14/15

19 23/30

500
9 1/2 - 5 8/12
3 5/6
500

Subtract and check your problem using Benchmark fractions

7 3/8 - 2 4/9 

4 67/72

Benchmark = 7 1/2 - 2 1/2 = 5

500

This is the fraction of 5th grade to the total number of upper grades at IRDS

1/5

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