Fluently Adding and Subtracting Three-Digit Whole Numbers

four hundred plus six hundred

• 1000

• 980

• 900

• 1200

351 - 70 =

• 301

• 271

• 281

• 291

What is 100 less than 547?

• 147

• 756

• 447

• 300

What is the missing number?

298, ___, 318, 328, 338

What number is 100 greater than the picture shown?

• 238

• 138

• 128

• 831

What is 100 more than 999?

• 1,099

• 1,000

• 989

• 2,000

479 - 88

• 391

• 390

• 380

• 381

Estimate 648 + 33 + 114 to the nearest ten.

• 780

• 790

• 880

• 890

A museum has 237 works of art on the first floor. The second floor has 349 works of art. About how many works of art in all? (Use rounding to the greatest place value.)

• 600

• 500

• 400

• 586

Fill in the blank to step 1 of the estimation plan.

__________ both numbers to the nearest ten.

• Round

• Add

• Subtract

• Count