Add and Subtract Unlike Fractions

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

Solve.

• 5/8

• 23/40

• 21/40

• 1/2

Tags

CCSS.7.NS.A.1C

Is this a correct answer?

• Yes, the student correctly added.

• No, you cannot add unlike denominators

• No, 5 + 7 is not 12

• No, 2 + 3 is not 5

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the first step in solving this problem? 
⅘ + ½ =

• Add the top parts of the fraction

• Rewrite the fractions in the simplest form. 

• Find a common denominator. 

• Make each fraction into an improper faction. 

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Find equivalent fractions with common denominators for the problem shown above.

• 4/15 and 2/15

• 24/30 and 20/30

• 12/15 and 2/15

• 12/15 and 10/15

Tags

CCSS.5.NF.B.5B

CCSS.4.NF.A.1

When adding or subtracting fractions with unlike denominators, what is the first step?

• Add the numerators

• Add the denominators

• Find a common denominator

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

When adding and subtracting fractions, what needs to be the same?

• the numerator

• the denominator

• nothing

• everything

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

Adding & Subtracting Fractions with

UNLIKE Denominators

• I'm ready to try

• Let's do this!

• I'm not sure about these.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

How can you find a common denominator?

• Add the denominators together

• Pick your favorite number

• Find a common multiple for the two denominators

After changing the denominator, what do you need to do to the numerator?

• Nothing

• Multiply the numerator by the same number as the denominator

• Double it

Tags

CCSS.5.NF.B.5B