Adding Three or More Fractions and Mixed Numbers with Unlike Denominators

What number could be a common denominator for these three fractions?
1/2   and   1/3   and   1/4

• 9

• 8

• 12

• 6

• 13 16/25
• 13 1/4
• 14 2/5

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What must you do first in order to add or subtract fractions with unlike denominators?

• add the numerators

• add the denominators

• find a common denominator

• find a common numerator

Tags

CCSS.7.NS.A.1C

Solve.
5/9 + 2/9 + 4/9

•  2/9

•   6/9

• 11/27

• 12/3

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

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.7.NS.A.1C

When the denominators are not the same, I must find a...

• common numerator

• common denominator

• equivalent fraction

• mixed number

Tags

CCSS.4.NF.A.1

CCSS.5.NF.B.5B

When adding or subtracting fractions, I NEVER add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

When adding or subtracting fractions, I always add or subtract the...

• numerators

• denominators

• mixed numbers

• equivalent fractions

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

Brooke had 3/5 of an apple pie and her mom had 2/7 of an apple pie.  How much apple pie do they have altogether?

• 35/35

• 5/12

• 31/35

• 1  2/35

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2