Adding and Subtracting Fractions with Like Denominators

What is a denominator?

• The number below the bar of a fraction.

• The number above the bar of a fraction.

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

38/50 + 7/50

• 45/100

• 26/50

• 45/50

• 81/100

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

36/40 - 24/40

• 60/80

• 12/0

• 12/40

• 12/20

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is 2/8 + 3/8 = ?

• 
• 
• 

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

5/10 + 1/10 = ?

• 10/10

• 6

• 3/10

• 6/10

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

4/6 - 1/6 = ?

• 5/6

• 1/12

• 3/6

• 5/12

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

7/7 - 5/7 = ?

• 
• 
• 
• 

Tags

CCSS.4.NF.B.3A

To add or subtract fractions you must have

• Common numerators

• Common denominators

• Common multiples

• common factors

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

If we have common denominators and we want to add or subtract them we need to

• add/subtract the numerator and slide over the denominator.

• add/subtract the numerator and add/subtract the denominator.

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D