Fractions Adding Subtracting Unlike Denominators

What is the best common denominator for this problem?

• 6

• 8

• 24

• 48

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

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

• common numerator

• common denominator

• equivalent fraction

• mixed number

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

• numerators

• denominators

• mixed numbers

• equivalent fractions

What is the sum of these fractions in lowest terms?

• 5/12

• 5/24

• 6/12

• 6/144

Solve and simplify if needed:

1/3 - 1/5 =

Mathematical Equivalence

OFF

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

• numerators

• denominators

• mixed numbers

• equivalent fractions

Once I have completed adding or subtracting fractions, I should always ____________ if possible.

• make equivalent fractions

• add again

• simplify

• multiply

What is the best common denominator for this problem?

• 5

• 2

• 20

• 10

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