Adding Fractions with Unlike Denominators

What number could be a common denominator for these two fractions?
1/5   and   5/6?

• 30
• 11
• 6
• 5

Tags

CCSS.4.NF.A.2

Which of these numbers could NOT be a common denominator for these three fractions?
1/3   and 2/5   and   3/10

• 15
• 30
• 60
• 90

Tags

CCSS.4.NF.A.2

CCSS.4.OA.B.4

Which of these numbers could NOT be a common denominator for these two fractions?
1/6   and   1/4

• 12
• 18
• 24
• 36

Tags

CCSS.4.NF.A.2

CCSS.4.OA.B.4

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

1/2 + 2/8 = 

• 3/10
• 6/8
• 5/8
• 7/8

Tags

CCSS.4.NF.B.3C

CCSS.4.NF.B.3D

1/3 + 4/9 =

• 7/9
• 5/9
• 6/9
• 5/12

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

2/6 + 1/2 =

• 5/6
• 3/6
• 4/6
• 3/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

1/9 + 2/27

• 3/27
• 5/27
• 3/27
• 3/36

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

1/4 + 3/8 =

• 5/8
• 3/8
• 4/12
• 4/8

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2