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 429 to the nearest hundred.

What is 400?

400

Round 513 to the nearest ten.

What is 510?

500

Round 936 to the nearest ten.

What is 940?

Estimating Sums

100

413 + 356 rounded to the nearest hundred.  

What is 400 + 400 = 800?

200

523 + 413 rounded to the nearest ten.

What is 520 + 410 = 730?

300

535 + 234 rounded to the nearest ten.

What is 540 + 230 = 770?

400

349 + 107 rounded to the nearest ten.

What is 350 +110 = 460?

500

291 + 268 rounded to the nearest hundred.

What is 300 + 300 = 600?

Estimating Differences

100

587 - 347 rounded to the nearest ten.

What is 590 - 350 = 240?

200

What is 146 - 118 rounded to the nearest hundred.

What is 200 - 100 = 100?

300

615 - 523 rounded to the nearest ten.

What is 620 - 520 = 100

400

682 - 224 rounded to the nearest ten.

What is 680 - 220 = 460?

500

588 - 332 rounded to the nearest hundred.

What is 600 - 300 = 300?

Finding Sums

100

345 + 276. 

What is 521?

200

542 + 109.

What is 651?

300

283 + 147.

What is 430.

400

127 + 39 + 87.

What is 253?

500

46 + 461 + 309.

What is 816?

Finding Differences

100

883 - 388.

What is 495?

200

246 - 127.

What is 119?

300

919 - 284.

What is 635?

400

500 - 245.

What is 255?

500

800 - 427.

What is 373?