Fluently Adding and Subtracting Three-Digit Whole Numbers

Estimate the sum of 327+431 by rounding to the nearest hundreds

• 700

• 600

• 758

• 800

Rewrite the problem.

• 700 + 70 + 4

• 700+60+14

Estimate the difference of: 788-572

• 100

• 300

• 1300

• 200

322 + 478 =

• 800

• 700

• 850

• 790

What is the sum of 345 and 278?

• 423

• 567

• 623

• 512

The fourth grade had 318 students. Over thanksgiving break, 97 students moved away, but 31 new students moved in. How many students are in fourth grade now?

Which equation best matches the story problem?

• (318+97) + 31

• (318-97) + 31

• (318-97)-31

• (318+97)-31

936 + 112 = 

• 1,058

• 958

• 948

• 1,048

Subtract 432 from 789. What is the difference?

• 512

• 357

• 245

• 678

Find the total when 523 and 367 are added together.

• 456

• 890

• 8900

• 1000

James have 90 marshmallows in the jar. He adds 382 more. How many marshmallows are now in the jar? 

• 472

• 289

• 340

• 198