add and subtract fractions

what is the denominator in this fraction: 6/15?

• 6

• 10

• 15

• 8

How do we add fractions with the same denominator?

• add numerators and denominators

• only add the numerator, keep denominator the same

• keep numerator, add denominators

• none of these

Add. 7/8+ 1/8=?

• 8/8 or 1

• 7/8

• 8/16

• 6/8

What is the numerator in this fraction: 9/12?

• 9

• 12

• 3

• 6

How do we subtract fractions with the same denominator?

• only subtract the numerator, keep denominator the same

• none of these

• subtract numerators and denominators

• keep numerator, subtract denominators

Subtract. 5/6 - 1/6 = ?

• 6/6 or 1

• 1/6

• 5/6

• 4/6