Topic 8 Review-EnVision Math 3rd Grade

What is the sum of 243, 132, and 157?

Find a reasonable estimate for the sum of 171 and 69. Select all that apply.

• 175 + 70 = 245

• 100 + 60 = 160

• 170 + 70 = 240

• 175 + 75 = 250

• 130 + 70 = 200

Subtract 382 - 148 mentally. Which of the following should you do first to find the difference?

• Add 2 to 148 and add 2 to 382.

• Add 2 to 148 and subtract 2 from 382.

• Subtract 8 from 148 and subtract 2 from 382

• Subtract 12 from 382 and add 12 to 148

Use mental math to add 332 and 154. Which of these shows how to break apart the numbers into hundreds, tens and ones?

• Break 332 into 320 + 12. Break 154 into 125 + 29

• Break 332 into 100 + 230 + 2. Break 154 into 100 + 52 + 2.

• Break 332 into 300 + 16 + 16. Break 154 into 100 + 27 + 27.

• Break 332 into 300 + 30 + 2. Break 154 into 100 + 50 + 4.

Use mental math to find 634 - 528.

Select all equations that are true.

• 32 + 56 + 10 = 10 + 56 + 32

• (49 + 28) + 5 = 49 + (28 + 5)

• 56 + 890 = 890 + 56

• 82 + 0 = 82

• 45 + 27 = 27 + 35

Use the subtraction work shown.

169

- 57

112

Which strategy shows a way to check the work using inverse operations?

• Subtract 57 from 169.

• Add 57 and 112.

• Add 112 and 169.

• Add 169 and 57.

Estimate the sum of 405 and 385 by rounding to the nearest hundred.

How can you use inverse operations to check the following equation?

456 - 342 = 114

• 456 X 342 = 114

• 114 + 342 = 456

• 342 - 456 = 114

• 456 + 342 = 114

Subtract 341 - 97 mentally. First add 3 to 97 to get 100. What should the next step be? What is the difference?

• Add 6 to 341. The difference is 247.

• Add 200 to 100. The difference is 100.

• Subtract 3 from 341. The difference is 238.

• Add 3 to 341. The difference is 244.