Round to the Nearest 10
Round to the Nearest 100
Would I find the Estimate or Exact?
Answer First, Round to Check if Reasonable
Word Problems
100

852

850

100

99

100

100

Lexa brought 87 pencils to school. She saw that Elizabeth had 235 pencils already. How many pencils do the girls have in total?

You would find the EXACT answer because it asks "How many..."

100

202 + 693

Answer: 693 + 202 = 895

Check: 700 + 200 = 900


THE ANSWER IS REASONABLE! 

100

For a bake sale, Miss McDermott made 453 muffins and Miss McCoy baked 389 brownies. About how many baked goods did the teachers bake altogether? 

Round to the nearest 10.

450 + 390 = 840 

The teachers made about 840 baked goods.

200

327

330

200

428

400

200

Michael brought in 622 cupcakes for his birthday. Sara brought in 988 cupcakes for her birthday. How many cupcakes did they bring in total?

You would find the ESTIMATED number because it asks "How many..."

200

912 + 238

912 + 238 = 1150 

900 + 200 = 1100


THE ANSWER IS REASONABLE!

200

Over the summer, Sofia read 321 books and Lorena read 348 books. About how many books did they read together? 

Round to the nearest 100.

300 + 300 = 600 


They read about 600 books altogether.

300

1,688

1,690

300

589

600

300

Justin got 988 pokemon cards for his birthday and he combined them with Yoel's 478 pokemon cards. Estimate the number of cards they now have altogether. 

You would find the ESTIMATED number because it tells you to "Estimate..."

300

893 - 415

893 - 415 = 478

900 - 400 = 500


THE ANSWER IS REASONABLE!

300

One afternoon, Maddie was hungry so she opened a bag of 588 gummy bears. She could only eat 302 gummy bears. About how many gummy bears were left in the bag?

Round to to the nearest 10.

590 - 300 = 290 


There were about 290 gummy bears left in the bag.

400

5,945

5,950

400

3,243

3,200

400

Maggie, Bri, and Raegan went trick-or-treating. Maggie collected 238 pieces of candy. Bri collected 456 pieces of candy, and Raegan collected 189 pieces of candy. About how many pieces of candy did the girls collect altogether?  

You would find the ESTIMATED number because it asks "About how many..."
400

1,083 + 478 = 

1,083 + 478 = 1,561 

1,000 + 500 = 1,500


THE ANSWER IS REASONABLE!

400

Miss McDermott went on a scavenger hunt and found 872 skeleton bones. She gave 456 to Miss McCoy and 23 to Mr. O. About how many bones was Miss McDermott left with?

Round to the nearest 10.

About 390 bones.

500

93,258

93,260

500

353,498

353,500

500

Yoel found $578 on the ground. He ran into Justin who had $294. About how much money do they have altogether?

You would find the ESTIMATE.

500

4,396 - 1,889 = 

EXACT: 2507

ROUNDED: 2500

YES THIS IS REASONABLE!

500

There were 1,367 cookies in the lunch room on Monday. After lunch, there were 732 cookies left. About how many cookies were eaten?


Round to the nearest 10. 

1,370 - 730 = 640


There were about 640 cookies left in the lunch room.

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