Common Denominator
Addition
Subtract
Equivalent Fractions
Estimate
100

 What is the lowest common denominater of the fractions 

2/4    and    3/8?

What is 8

100

2 3/4 + 2/8

What is 3

100

6/8 - 5/8


1/8

100

are these two fractions equivalent?

1/3 and 4/12

What is yes 

100

Use estimation bench marks to add the following fractions


1/4 + 4/6

What is 3/4 or 1/2

200

What is the lowest common denominator of the fractions

1/3 and 3/4?

What is 12

200

6/10 + 6/15

What is 1 

200

3/4 - 2/8

What is 1/2

200

are these two fractions equivalent?


1234/1234 and 2/2

What is yes

200

Use estimation bench marks to add the following fractions


1/6 + 3/8

What is 1/2 or 3/4

300

What are two equivalent fractions with common denominators for


4/6 and 3/4? (Using their LCM)?

What is 8/12 and 9/12

300

3 1/3 + 5/3

What is 5

300

3 8/10 - 1 1/2

What is 2 3/10

300

Are these fractions equivalent?


5/6 and 20/36

What is no

300

Use estimation bench marks to add the following fractions


6/7 + 2 4/5

What is 4

400

What are two equivalent fractions with common denominators for


2/7 and 3/6?

What is 12/42 and 21/42

400

6/2 + 15/7

What is 5 1/7

400

3 1/8 - 1 3/16

What is 1 15/16

400

Are these fractions equivalent?

13/15 and 3/5

What is no

400

Use estimation bench marks to subtract the following fractions


3 8/9 - 3/6?

What is 3 1/2

500

What are two equivalent fractions with common denominators for


3/13 and 2/52? (LCM)

What is 6/26 and 1/26

500

2 1/7 + 3 2/3

1 55/72

500

7 3/8 - 2 7/9

What is 43/72

500

Are these fractions equivalent?


13/45 and 39/135

What is yes

500

Explain how you know that 6/8 + 7/9 is greater than 1


What is correct