Add Common Denominator

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

• 12

• 18

• 24

• 36

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

What do you need to have when adding unlike fractions?

• common denominator

• common numerator

• common numerator and denominator

What is the least common denominator of 1/7 and 3/6?

• 14

• 21

• 7

• 42

What must you have to add and subtract fractions?

• Common numerators

• Different numerators

• Different denominators

• Common denominators

What should Carl do next?

• Circle "6" and use it as the common denominator

• Circle "12" and use it as the common denominator

• Add 1/3 + 3/4 and get 4/7

• List all of the multiples of 1

What is the the next step to finding this answer?

• Add the numerators (1+1=2)

• Multiply 12 X 1 for both fractions to find a new numerator

• Multiply to find each new numerator by the multiple used to get 12. (3 X1) (4 X 1)

• This is a mistake, you don't need to convert to twelfths

In order to add fractions, I need a(n) ​ (a)  

• common denominator.

• mixed number

• improper fraction

• 2/5
• 5/6
• 4/6
• 1/5

Q1. What is the ratio of 14 to 16?

• 14/16

• 7/8

• 8/7

• 4/10