## Envision Math 3rd Grade Textbook Answer Key Topic 2 Reteaching

**Reteaching**

**Set A, pages 24-25**

What is the number halfway between 800 and 900?

Use a number line.

Find the number that is the same distance from the beginning number and the ending number.

The number that is halfway between 800 and 900 is 850.

**Remember** to check that your number is the same distance from the beginning number and the ending number on a number line.

Find the number halfway between each pair of numbers.

Question 1.

60 and 70

Answer:

Question 2.

2,000 and 3,000

Answer:

Question 3.

900 and 1,000

Answer:

Question 4.

3,300 and 3,400

Answer:

Question 5.

860 and 870

Answer:

**Set B, pages 26-28**

Round 867 to the nearest hundred.

On the number line, 867 is closer to 900 than to 800.

You can also use place value.

Since 6 > 5, increase the digit in the hundreds place by one. Then change all the digits to the right to zero.

To the nearest hundred, 867 rounds to 900.

**Remember** to think of the halfway number when rounding.

Round to the nearest ten.

Question 1.

65

Answer:

Question 2.

813

Answer:

Question 3.

489

Answer:

Question 4.

24

Answer:

Question 5.

78

Answer:

Question 6.

942

Answer:

Round to the nearest hundred.

Question 7.

229

Answer:

Question 8.

349

Answer:

Question 9.

651

Answer:

Question 10.

856

Answer:

Question 11.

109

Answer:

Question 12.

783

Answer:

**Set C, pages 30-31**

Round 2,613 to the nearest thousand. You can use place value.

- Find the digit in the rounding place. That digit is 2.
- If the next digit to the right is 5 or greater, increase the digit in the rounding place by 1. If the next digit is less than 5, keep the digit in the counding place as it is. Since 6 > 5, increase the 2 to 3.
- Change all the digits to the right of the rounding place to zero.

To the nearest thousand, 2,613 rounds to 3,000.

**Remember** to compare the correct digit to 5 to find if the digit in the rounding place should change.

Round to the nearest thousand.

Question 1.

3,817

Answer:

Question 2.

6,495

Answer:

Question 3.

8,562

Answer:

Question 4.

1,709

Answer:

Question 5.

2,500

Answer:

Question 6.

7,248

Answer:

Question 7.

5,692

Answer:

Question 8.

3,178

Answer:

Question 9.

9,714

Answer:

Round to the nearest hundred.

Question 10.

2,136

Answer:

Question 11.

5,624

Answer:

Question 12.

4,449

Answer:

Question 13.

7,751

Answer:

Question 14.

6,275

Answer:

Question 15.

8,941

Answer:

Question 16.

4,307

Answer:

Question 17.

9,768

Answer:

Question 18.

3,549

Answer:

**Set D, pages 32-33**

Follow these steps for using Try, Check, and Revise to solve problems.

Step 1: Think to make a reasonable first try.

Step 2: Check using information from the problem.

Step 3: Revise. Use your first try to make a reasonable second try. Check.

Step 4: Continue trying and checking until you find the correct answer.

**Remember** to check each try.

Use Try, Check, and Revise to solve.

Question 1.

Mark and Tony have 32 markers. Mark has 2 more markers than Tony. How many markers does each boy have?

Answer:

Question 2.

There are 28 players in the soccer club. There are 4 more girls than boys. How many boys are in the soccer club?

Answer:

Question 3.

Jason and Dave have 45 baseball cards together. Jason collected 7 fewer cards than Dave. How many baseball cards does Dave have?

Answer: