Estimating Sums and Differences of Fractions

What is the first step in estimating sums and differences of fractions?

• Convert fractions to decimals

• Use benchmark fractions

• Find the least common denominator

• Multiply the fractions

Which of the following is NOT a benchmark fraction?

• 1/5

• 1/2

• 1/3

• 1/4

When estimating 7/10 on a number line, which benchmark fraction is it closest to?

• 1

• 0

• 1/4

• 1/2

If two-fifths is estimated on a number line, which benchmark fraction is it closest to?

• 1/4

• 3/4

• 0

• 1/2

What is the estimated result of 7/15 plus 4/10 using benchmark fractions?

• 1 and 1/2

• 0

• 1/2

• 1

Which fraction is closest to 1 when estimating 11/12?

• 1/2

• 0

• 3/4

• 1

What is the estimated sum of 9/10 and 5/6 using benchmark fractions?

• 1

• 2 and 1/2

• 1 and 1/2

• 2

Which fraction is closest to 1/2 when estimating 5/12?

• 3/4

• 1/2

• 1/4

• 0

What is the estimated difference of 14/16 minus 5/8 using benchmark fractions?

• 1/2

• 1/4

• 1

• 0

Which fraction is closest to 0 when estimating 2/9?

• 0

• 1/4

• 1/2

• 3/4