Envision Math Grade 3 Answer Key Topic 2 Reteaching

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: