Adding and Subtracting Fractions

Least Common Denominator

100

What is the LEAST common denominator for the pair of fractions: 1/3 and 5/6?

LCD = 6

200

What is the LEAST common denominator for the pair of fractions: 1/4 and 2/3?

LCD = 12

300

What is the LEAST common denominator for the pair of fractions: 1/3 and 4/9?

LCD = 9

400

What is the LEAST common denominator for the pair of fractions: 5/6 and 2/5?

LCD = 30

500

What is the LEAST common denominator for the pair of fractions: 7/15 and 4/9?

LCD = 45

Equivalent Fractions

100

Use the LCD to write an equivalent fraction for each fraction: 1/3 and 5/6

2/6 and 5/6

200

Use the LCD to write an equivalent fraction for each fraction: 1/4 and 2/3

3/12 and 8/12

300

Use the LCD to write an equivalent fraction for each fraction: 1/3 and 4/9

3/9 and 4/9

400

Use the LCD to write an equivalent fraction for each fraction: 5/6 and 2/5

25/30 and 12/30

500

Use the LCD to write an equivalent fraction for each fraction: 7/15 and 4/9

21/45 and 20/45

Add/Subtract Fractions

100

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  9/10 - 1/3

17/30

200

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  3/8 + 1/4

5/8

300

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  1/2 + 1/4

3/4

400

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  2/3 - 1/5

7/15

500

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  10/18 - 2/9

6/18

Add/Subtract Mixed Numbers

100

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  4 1/8 + 2 1/3

6 11/24

200

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  5 3/7 - 2 1/5

3 8/35

300

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  10 5/9 - 9 1/6

1 7/18

400

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  7 2/3 - 3 1/6

4 3/6 (or 4 1/2)

500

Find the sum or difference.  (Use LCD and write equivalent fractions first.)  1 5/12 + 4 1/6

5 7/12

Mixed Numbers: Carry & Borrow

100

Find the sum or difference.  (Use LCD and write equivalent fractions first.  Don't forget to carry.) 8 1/2 + 6 3/5

15 1/10

200

Find the sum or difference.  (Use LCD and write equivalent fractions first.  Don't forget to carry.) 3 5/8 + 5/12

4 1/24

300

Find the sum or difference.  (Use LCD and write equivalent fractions first.  Don't forget to borrow.) 9 - 3 7/8

5 1/8

400

Find the sum or difference.  (Use LCD and write equivalent fractions first.  Don't forget to borrow.) 8 1/16 - 5 1/2

2 9/16

500

Find the sum or difference.  (Use LCD and write equivalent fractions first.  Don't forget to borrow.) 7 1/6 - 4 5/8

2 13/24