Addition / Subtraction Review

Rounding

100

Round 345 to the nearest ten.

What is 350?

200

Round 23,678 to the nearest hundred.

What is  23, 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

4,623 + 4,313 ESTIMATE the sum

What is 5,000 + 4,000 = 9,000?

300

5,535 + 4,234 ESTIMATE the sum

What is 6,000 + 4,000 = 10,000?

400

88,349 + 42,682 ESTIMATE the sum

What is 90,000 + 40,000 = 130,000?

500

5,331,291 + 6,335,768 ESTIMATE the sum

What is 5,000,000 + 6,000,000 = 11,000,000?

Estimating Differences

100

587 - 347 ESTIMATE

What is 600 - 300 = 300?

200

What is 1,686 - 118 ESTIMATE

DAILY DOUBLE

What is 2,000 - 100 = 1,900?

or

1,700 - 100 = 1,600

300

6,315 - 4,423 ESTIMATE

What is 6,000 - 4,000 = 2,000

400

66,682 - 23,224 ESTIMATE

What is 70,000 - 20,000 = 50,000?

500

870,588 - 166,332 ESTIMATE

What is 900,000 - 200,000 = 700,000?

Finding Sums

100

345 + 276. 

What is 521?

200

8,542 + 1,109.

What is 9,651?

300

5,283 + 4147.

What is 9,430.

400

61,234 + 15,678.

What is 76,912?

500

4,344,681 + 283,309.

What is 4,627,990

Finding Differences

100

800 - 388.

What is 412?

200

246 - 127.

What is 119?

300

8,919 - 5,284.

What is 3,635

400

72,500 - 11,245.

What is 61,255?

500

500,800 - 22,427.

What is 478,373