Wk. of April 27th Sub. fractions with unlike denominator.

This is not a question..it is just rules to help you with this assignment.

Rules for subtracting fractions with unlike denominators.

Look to see if you can use one of your denominators in your problem.

If you can't find the denominator, you will have to find the least common multiple of your two denominators. Remember the magic squares, if you need them.

Don't forget you have to re-write your problem and stack it or write it vertically .

What must you have to add and subtract fractions?

• Common numerators
• Different numerators
• Different denominators
• Common denominators

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

8/9 - 1/3 = 

• 7/6
• 5/9
• 2/3
• 8/27

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Subtract 9/20 - 1/4.

• 1/2

• 8/16

• 4/20

• 4/20

7/10 - 1/2 = _____

• 2/10

• 2/10

• 6/10

• 8/2

1/3 -1/9

• 1/9

• 2/9

• 3/9

• 0/6

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

3/12 - 1/4

• 4/12

• 3/12

• 1/12

• 0

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the difference?

• $\frac{13}{24}$

• $\frac{5}{24}$

• $\frac{12}{48}$

• $\frac{6}{5}$

Tags

CCSS.7.NS.A.1C

What is 9/10 - 3/4?

• 5/7
• 3/20
• 3/8 
• 9/10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

 $\frac{8}{9}-\frac{5}{6}$  

•  $\frac{1}{18}$  

•  $\frac{3}{3}$  

•  $\frac{3}{18}$  

•  $\frac{1}{54}$  

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2