## Envision Math 3rd Grade Textbook Answer Key Topic 2.1 Finding the Halfway Number

Review What You Know

Vocabulary
Choose the best term from the box,

Question 1.
In 259, the 2 is in the ? place.

Question 2.
In 259, the 9 is in the ? place.

Question 3.

Place Value

Copy and complete,
Question 4.
35 = ☐ tens ☐ ones

Question 5.
264 = ☐ hundreds ☐ tens ☐ ones

Question 6.
302 = ☐ hundreds ☐ tens ☐ ones

Write each sum
Question 7.
3 + 5

Question 8.
1 + 8

Question 9.
6 + 4

Question 10.
4 + 3

Question 11.
8 + 2

Question 12.
6 + 6

Question 13.
7 + 6

Question 14.
8 + 6

Question 15.
9 + 9

Question 16.
Janika bought 3 books on Monday and 6 books on Tuesday. How many books did she buy in all?

Question 17.
Writing to Explain Derrick has 4 red, 2 blue, 2 green, 2 yellow, and 2 orange balloons. Explain how to skip count to find how many balloons he has in all.

Finding the Halfway Number

How can you find the number halfway between two numbers?
What number is halfway between 80 and 90?
85 is halfway between 80 and 90.

Guided Practice

Do you know HOW?
Find the number halfway between each pair of numbers.
Question 1.
40 and 50

Question 2.
9,000 and 10,000

Do you UNDERSTAND?
Question 3.
Writing to Explain Look at the number line above that shows 6,000 and 7,000. How do you know that 6,800 is not the halfway number?

Question 4.
A road has a mile marker every mile. Marge has stopped at a rest area at mile marker 60. There is a gas station at mile marker 70. What mile marker is halfway between Marge and the gas station?

Independent Practice

Find the number halfway between each pair of numbers. You may draw number lines to help.
Question 5.
20 and 30

Question 6.
40 and 50

Question 7.
90 and 100

Question 8.
700 and 800

Question 9.
300 and 400

Question 10.
800 and 900

Question 11.
4,000 and 5,000

Question 12.
8,000 and 9,000

Question 13.
8,800 and 8,900

Question 14.
6,300 and 6,400

Question 15.
2,000 and 3,000

Question 16.
7,600 and 7,700

What is the number halfway between 400 and 500?

450 is halfway between 400 and 500.
What is the number halfway between 6,000 and 7,000?

6,500 is halfway between 6,000 and 7,000.

When you find the number that is the same distance from both of the other numbers.

Problem Solving

For 17-19, find the halfway number for each number line.
Question 17.

Question 18.

Question 19.

Question 20.
Look back at your answers for problems 17–19. How are they alike?

Question 21.
Jack read 132 pages in one week. Jim read 125 pages in the same week. Who read more pages? Explain how you know?

Question 22.
The length of the world’s largest American flag is halfway between 500 feet and 510 feet. How many feet long is this flag?

Question 23.
Ricardo says that 5,600 is halfway between 5,000 and 6,000. Is he correct? Why or why not?

Question 24.
Writing to Explain Explain how to find the number halfway between 500 and 600.

Question 25.
The number 650 is halfway between which pair of numbers?
A. 65 and 6,500
B. 500 and 600
C. 600 and 700
D. 6,000 and 7,000