Estimating Sums and Differences with Fractions

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

• Convert fractions to decimals

• Round fractions to the nearest whole number

• Add the fractions directly

• Subtract the fractions directly

How do you round a fraction that is equal to or greater than one-half?

• Round up

• Keep it the same

• Convert to a decimal

• Round down

If a fraction is less than one-half, what should you do?

• Convert to a decimal

• Keep it the same

• Round down

• Round up

What is the result of rounding 5 and 4/10 to the nearest whole number?

• 6

• 5

• 5.5

• 4

What is a quick trick to determine if a fraction is greater than one-half?

• Add the numerator and denominator

• Subtract the numerator from the denominator

• Convert the fraction to a decimal

• Double the numerator and compare it to the denominator

What is the rounded whole number for 17/30?

• 2

• 0

• 1

• 3

When estimating the sum of 8 and 3/9, what is the rounded whole number for 3/9?

• 9

• 8

• 1

• 0

What is the estimated sum of 8 and 7 when rounding 4/9 and 3/9?

• 14

• 15

• 16

• 17

If 6/12 is exactly one-half, what should you do when rounding?

• Round down

• Round up

• Convert to a decimal

• Keep it the same

What is the estimated difference of 18 and 5/9 when rounding 3/7 and 5/9?

• 13

• 12

• 11

• 10