Addition / Subtraction Review

Rounding

100

Round 345 to the nearest ten.

What is 350?

200

Round 678 to the nearest hundred.

What is 700?

300

Round 7,429 to the nearest thousands.

What is 7,000?

400

Round 15,513 to the nearest thousand.

What is 16,000?

500

Round 92,936 to the nearest Hundred Thousand.

What is 100,000?

Estimating Sums

100

413 + 356 ESTIMATE the sum 

What is 400 + 400 = 800?

200

523 + 413 ESTIMATE the sum

What is 500 + 400 = 700?

300

535 + 234 ESTIMATE the sum

What is 500 + 200 = 700?

400

349 + 682 ESTIMATE the sum

What is 300 +700 = 1,000?

500

31,291 + 335,768 ESTIMATE the sum

What is 30,000 + 300,000 = 330,000?

Estimating Differences

100

587 - 347 ESTIMATE

What is 600 - 300 = 300?

200

What is 186 - 118 ESTIMATE

What is 200 - 100 = 100?

300

615 - 523 ESTIMATE

What is 600 - 500 = 100

400

682 - 224 ESTIMATE

What is 700 - 200 = 500?

500

17,588 - 11,332 ESTIMATE

What is 20,000 - 10,000 = 10,000?

Finding Sums

100

345 + 276. 

What is 521?

200

542 + 109.

What is 651?

300

5,283 + 4147.

What is 9,430.

400

61,234 + 15,678.

What is 76,912?

500

344,681 + 283,309.

What is 627,990

Finding Differences

100

800 - 388.

What is 412?

200

246 - 127.

What is 119?

300

8,919 - 5284.

What is 3,635

400

72,500 - 11,245.

What is 61,255?

500

500,800 - 22,427.

What is 478,373