Sums and Differences

Fill in the blank to step 2 of the estimation plan.

__________ the equation and ________ the numbers.

• Rewrite and stack

• Add and Subtract

• Round and give up

What is the estimate of 28+33?

• 60

• 61

• 50

• 51

What is the estimate of 31-25?

• 0

• 6

• 10

• 60

Jill took 32 minutes to complete math homework and 16 minutes to complete reading. About how many minutes did Jill use for homework altogether?

• 48 minutes

• 50 minutes

• 55 minutes

• 40 minutes

Estimate to the ten thousands place.  
47,623 - 12,385 =

• 40

• 34,238

• 40,000

• 30,000

Estimate to the thousands place.
847,167 - 382,208 =

• 500,000

• 464,000

• 464,959

• 465,000

Estimate to the thousands place.
6,375 - 1890 =

• 4,485

• 4,500

• 4,000

• 5,000

Estimate to the thousands place.
163,762 + 3,210 =

• 167,000

• 166,972

• 168,000

• 166,800

Estimate to the thousands place.
6,138 + 5,963 + 6,023 + 5,874 + 6,003

• 31,000

• 30,001

• 28,000

• 30,000

Estimate the sum of 37+99 by rounding to the nearest tens

• 120

• 150

• 140

• 136