Adding/Subtracting Fractions

Comparing Fractions

100

Which is greater:

 9/10 or 2/5?

9/10

200

Which is greater:

 9/13 or 7/13?

9/13

300

Which is greater:

 5/12 or 5/14?

5/12

400

Which is greater:

 9/20 or 21/40?

21/40

500

Which is greater:

 17/13 or 11/12?

17/13

Estimating with Fractions

100

Estimate, using benchmarks of 0, 1/2, and 1

1/8+3/5

1/2

200

Estimate, using benchmarks of 0, 1/2, and 1

7/8+11/12

2

300

Estimate, using benchmarks of 0, 1/2, and 1

9/11-3/7

1/2

400

Estimate, using benchmarks of 0, 1/2, and 1

3/25+14/15

1

500

Estimate, using benchmarks of 0, 1/2, and 1

3 1/7- 1 3/8

1.5

Common Denominators

100

What could you use as a common denominator for this pair of fractions?

1/3 and 5/6

6 (or 12 or 18 or ...)

200

What could you use as a common denominator for this pair of fractions?

5/9 and 1/2

18

300

What is the lowest common denominator for this pair of fractions?

3/4 and 7/10

20

400

What is the lowest common denominator for this pair of fractions?

11/15 and 9/10

30

500

What is the lowest common denominator for this pair of fractions?

6/7 and 1/6

42

Adding

100

3/5 + 1/5

4/5

200

1/2 + 3/8

7/8

300

2/5 + 1/4

13/20

400

5/9 + 1/6

13/18

500

7/8 + 11/12

43/24

Subtracting

100

1/2 - 3/8

1/8

200

3/5 - 1/5

2/5

300

2/5 - 1/4

3/20

400

5/9 - 1/6

7/18

500

11/12 - 7/8

1/24