Estimating Sums and Differences by Rounding

237 fifth graders and 346 fourth graders went on a field trip. Estimate how many more fourth graders were on a field trip than fifth graders.

• 200 more

• 109 more

• 100 more

• 110 more

If you have 382, you might say you have ABOUT...

• 400

• 390

• 450

• 350

If you have 819, you might say you have approximately...

• 900

• 880

• 820

• 810

Mrs. Krutak used 1,820 pencils last year. This year she thinks she will use 1,932 pencils. About how many pencils is that all together?

• 3,000.

• 3,700.

• 4,000.

• 3,752.

ESTIMATE to find the sum, by rounding to the largest place values.

853,471 + 36,839

• 840,000

• 940,000

• 1,000,000

• 1,300,000

Misael has 745 points on class dojo. Yubina has 611 points. About how many points do they have together?

• 1,356

• 1,300

• 134

• 100

Round to the nearest ten thousand, then estimate the difference:

887,167 - 342,208 =

• 500,000

• 554,000

• 545,959

• 550,000

Round to the nearest thousand, then estimate the difference:

98,412 - 45,802

• 53,000

• 51,000

• 52,000

• 51,872

Round to the nearest hundred, then estimate the sum:

123 + 456

• 580

• 600

• 650

• 500

There are 293 steps to the top of the Leaning Tower of Pisa in Italy.  To the nearest hundred, about how many steps are there?

• 200

• 300

• 290

• 250