Adding and Subtracting Unlike Denominators

The image is showing process is to add unlike denominators fractions:

TRUE or FALSE

• TRUE

• FALSE

When Adding UNLIKE denominators fractions: To find the denominator, you need to

• Multiply numerators

• Cross multiply the denominators

• Multiply denominators

• Add denominators

When Adding UNLIKE denominators fractions:

To find the numerator, you need to

• The denominator remain the same

• Cross multiply the denominators and add the results

• Multiply denominator

• Add numerators

What is the sum of these fractions in lowest terms?

• 4/5

• 3/20

• 17/20

• 4/20

Add

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

What is the least common denominator you could use to subtract 1/3 and 1/4?

• 3

• 4

• 24

• 12

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

• 14

• 21

• 7

• 42

What would be the common denominator for adding 1/2 + 3/4?

• 6

• 4

• 9

• 2