Estimation
Rounding
Addition
Subtraction
Word Problems
100
What two numbers would you use to make a number closest to 900?


451   502    346,    694,    831

451 and 502

100

27 rounded to the nearest 10.

What is 30?

100

76+89=

What is 165?

100

88-29=

What is 59?

100

Ms. Bates baked 283 cookies on Friday.  On Saturday she baked 187 cookies.  How many more cookies did she bake on Friday than on Saturday?

What are 96 more cookies on Friday?

200

What two numbers would you use to make a sum closest to 1000?


467,    802,   214,     303,   629

802 

214

200

124 rounded to the nearest 10.

What is 120?

200

127+183=

What is 310?

200

189-178=

What is 11?

200

Najat says that 367 + 429 is about 1,000.  Do you agree or disagree?


I disagree because the sum is closer to 800.

300
Estimate the sum of 235 + 456 by rounding to the nearest 10.

700

300

1,325 rounded to the nearest 10.

What is 1,330?

300

Estimate the answer for 258+387

What is 650?

300

600-241=

What is 359?

300

Which two numbers have a sum closest to 1,000?

327         482           600           398

What are 600 and 398?

400

Estimate the difference of 689-224 by rounding to the nearest hundred.

500

400

2,344 rounded to the nearest 100.

What is 2,300?


400

127+320=____

447

400

625 - 48 = 

577

400

The fourth grade has 363 students.  Over winter break, 94 students moved away, but 26 new students moved in.  How many fourth graders are there now?

What are 295 fourth graders?

500

Estimate the sum of 1, 546+ 2,342 by rounding to the nearest hundred. 

3,800

500

12,478 rounded to the nearest hundred.

What is 12,500?

500

____=342+641

983

500

 727 - 268

459

500

Yusuf and Khadro collect cans to recycle.  Yusuf has 275 cans and Khadro has 168 cans.  On their way to the recycling center, their bag breaks and 89 cans fall out.  How many cans do they have now?

What are 354 cans?

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