Estimating Fraction Sums and Differences

Use the number lines to help decide if the sum of

 $\frac{5}{8}+\frac{8}{10}$  is greater than 1 or less than one.

• Greater than one.

• Less than one

Use the number lines to help decide if the sum of

 $\frac{1}{8}+\frac{1}{5}+\frac{1}{10}$  is greater than 1 or less than one.

• Greater than one.

• Less than one

Use the number lines to help decide if the difference of

 $\frac{7}{8}-\frac{1}{10}$  is less than  $\frac{1}{2}$  or greater than  $\frac{1}{2}$  .

• Greater than  $\frac{1}{2}$  

• Less than  $\frac{1}{2}$  

Use the number lines to help decide if the difference of

 $\frac{9}{10}-\frac{5}{8}$  is less than  $\frac{1}{2}$  or greater than  $\frac{1}{2}$  .

• Greater than  $\frac{1}{2}$  

• Less than  $\frac{1}{2}$  

Use < or > to show which sum is reasonable.

• 1/3 + 1/2 > 1

• 1/3 + 1/2 < 1

Use < or > to show which sum is reasonable.

• 3/5 + 1/2 > 1

• 3/5 + 1/2 < 1

Use < or > to show which difference is reasonable.

• 3/4 - 1/8 >1

• 3/4 - 1/8 <1

Use < or > to show which difference is reasonable.

• 8/10 - 1/2 > 1/2

• 8/10 - 1/2 < 1/2

Estimate whether the sum is reasonable. 1/10 + 3/5 is about 1.

• Reasonable

• Not reasonable

Estimate whether the difference is reasonable. 7/10 - 2/5 is about 1/4.

• Reasonable

• Not reasonable