Math 10.4

A

100

 3. 347 + 242 =

589

200

6. 367 + 423 = 

790

300

8. Mark found the sum of 127 and 345. 

Explain his mistake.

   127

+ 345

   400

       6

  + 12

    418

Mark did not add the tens correctly. 20 + 40 = 60 

not 6. The correct sum is 400 + 60 + 12= 472

400

10. 349 people are on a boat, 255 people are on another boat.  How many people are on both boats?

604

500

12. Which is the same amount as 238 + 164?

200 + 190 + 12

300 + 90 + 12

402

400 + 10 + 2

200 +190 + 12

300 + 90 + 12

402

B

100

4. 193 + 243= 

436

200

7. 508 + 347 = 

855

300

9. Find the sum of 137 + 324. Write  the sum in two ways.

461

Way 1: 400 + 50 + 11

Way 2: four hundred sixty one

400

11. 163 students are in first grade. 217 students are in second grade.  How many students are in both grades?

380

C

100

5. 281+406=

687