Finding Least Common Denominators With Unlike Denominators

What is the least common denominator for 7 and 2?

• 12

• 14

• 7

• 6

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

• 9

• 8

• 12

• 6

When adding and subtracting fractions, which value needs to be the same in all values being added/subtracted?

• Numerator

• Denominator

What is the first step of adding or subtracting two fractions?

• Checking if the numerators are the same

• Checking if the denominators are the same or different

• Checking that the fractions are equal

• Adding or subtracting

When you add or subtract fractions with unlike denominators you..

• Find the greatest common factor to change your denominator

• Change the denominator by picking a random number then divide

• Find the least common multiple to change your denominator

• none of these are true

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

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

• 30

• 11

• 6

• 5

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

• 3

• 4

• 7

• 12

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. 

What is the best Common Denominator for the Given Problem?

• 48

• 24