Topic 8 3rd Grade Envision Review

Properties of +/-

100

Which shows the Commutative Property of Addition?

a. 5+0=5

b. 3+4=4+3

c. (2+3) +4=2+3+4

d. 6+1=7

b. 3+4=4+3

200

Which shows the Associative Property of Addition?

a. 8+0=0+8

b. 9+0=9

c. (2 + 6) + 4 = 2 + (6 + 4)

d. 5 + 3 = 3 + 5

c. (2 + 6) + 4 = 2 + (6 + 4)

300

What property of addition is shown below?

a+0=a

identity property

400

Which of these equations shows the inverse property?

a. 123+456=579 = 579-456=123

b. 123+456 = 579 = 579-123=456

c. 123+456=579 = 456-579=123

a and b :)

500

What is the inverse of the following equation?

1,234-567=667

667+567=1,234

Adding using Mental Strategies

100

What is 190 + 139?

330     329     293    339

 

329

200

What is 347 + 256?

593      603    613      703

603

300

What is 468 + 379?

737       827   847      857

847

400

What is 523 + 198?

711    721    731   621

721

500

1,198+345=?

1,543      1,443      1,643

1,543

Subtraction using Mental Strategies

100

950-450=?

500

200

880-230=?

650

300

733-621

112

400

635-298

337

500

919-728

191

Rounding to the Nearest 10

100

Round 67 to the nearest 10.

70

200

Round 162 to the nearest 10

160

300

Estimate the sum by rounding the addends to the nearest 10.

132 + 148 = ?

280

400

Round 1,678 to the nearest 10

1,680

500

Estimate by rounding each addend to the nearest 10:

1,234 + 567 = ?

1,800

Rounding to the nearest 100

100

Round 678 to the nearest 100

700

200

Round 623 to the nearest 100

600

300

Estimate the difference by rounding to the nearest 100:

623-99 = ?

500

400

Estimate the difference by rounding to the nearest 100:

234-192=?

0

500

Estimate the difference by rounding to the nearest 100:

1,234-198

1,000