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100

Select the expression that has the same value as:

251+143


a. 222+210.                        c. 592-294

b. 694-300

B. 694-300

100

250+____________=1,000

750

100

725+243

968

100

Choose the correct value of

89+32+5+11

a.177.                      c.201

b.137

B. 137

200

Select the expression that has the same value as:

692-411

a.756-112                       c. 435-154

b. 149+101

C. 435-154

200

680+__________=1,000

320

200

647-46

601

200

Here is how Jada found the value of 741+179

741+9=750

750+100=850

Explain Jada's error

Jada forgot to add the 70 from 179 onto 850

300

Select the expression that has the same value as:

723+200

a. 566+357                        c. 845+111

b. 699+444

A. 566+357

300

___________+590=1,000

410

300

266+438

704

300

Below is Tyler's work for solving 652-346. Explain and correct his error

600-300=300

50-40=10

6-2=4

Tyler did not realize he could not take 6 ones away from two ones. He needs to regroup a ten!

answer:306

400

Select the expression that has the same value as:

840-436

a. 825-333                      c. 710-456

b. 910-506

B. 910-506

400

600-440=__________

160

400

293-147

146

400

Clare uses these equations to solve 300-178. So you agree with her work? Explain.

178+2=180

180+20=200

200+100=300

Her equations show that 178+122 equals 300. She decided to count up from 178 instead of taking away 122 away from 300. 

500

Select the expression that has the same value as:

800-378


a. 307+115                      c. 678-509

b. 377-102

A. 307+115

500

900-370=___________

530

500

736-558

178

500

John says that to find the value of the expression

547-167 he can subtract 200 and then add 33. 

Explain why he is correct

John is correct because subtracting 200 and adding back 33 is the same as subtracting 33 fewer. 33 fewer than 200 is 167.