All the solutions provided in **McGraw Hill Math Grade 2 Answer Key PDF Chapter 1 Lesson 5 Add Three Numbers** will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 2 Answer Key Chapter 1 Lesson 5 Add Three Numbers

**Explore and Explain**

**Teacher Directions:** Have students use counters to show the following: There are 4 fish, 6 frogs, and 2 snakes in the pond. Trace the counters and write how many in all.

Explanation:

**See and Show**

You can group addends in different ways. The sum will stay the same.

**Helpful Hint**

Look for facts you know.

**Find each sum. Circle the numbers you add first. Write that sum in the box.**

Question 1.

2 + 4 + 2 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

2 + 4 = 6

6 + 2 = 8

Question 2.

9 + 1 + 2 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

9 + 1 = 10

10 + 2 = 12

Question 3.

7 + 4 + 7 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 7 = 14

14 + 4 = 18

Question 4.

2 + 7 + 8 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 2 = 9

9 + 8 = 17

Question 5.

3 + 7 + 4 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 3 = 10

10 + 4 = 14

Question 6.

5 + 3 + 5 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

5 + 5 = 10

10 + 3 = 13

**Talk Math** How do you decide which two numbers to add first when adding three digits?

First we try to make 10

or add the doubles.

**Helpful Hint**

Add two numbers first. Look for facts you know.

**On My Own**

**Find each sum. Circle the numbers you add first. Write that sum in the box.**

Question 7.

4 + 3 + 4 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

4 + 4 = 8

8 + 3 = 11

Question 8.

4 + 3 + 7 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 3 = 10

10 + 4 = 14

Question 9.

2 + 8 + 3 = _____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

8 + 2 = 10

10 + 3 = 13

Question 10.

6 + 1 + 6 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

6 + 6 = 12

12 + 1 = 13

**Find each sum.**

Question 11.

5 + 5 + 5 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

5 + 5 = 10

10 + 5 = 15

Question 12.

6 + 6 + 3 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

6 + 6 = 12

12 + 3 = 15

Question 13.

7 + 4 + 7 = ___

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 7 = 14

14 + 4 = 18

Question 14.

9 + 8 + 1 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

9 + 1 = 10

10 + 8 = 18

Question 15.

1 + 7 + 3 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 3 = 10

10 + 1 = 11

Question 16.

5 + 7 + 5 = ____

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

5 + 5 = 10

10 + 7 = 7

Question 17.

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 3 = 10

10 + 5 = 15

Question 18.

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

7 + 7 = 14

14+ 1 = 15

Question 19.

Answer:

Explanation:

If we add the addends in different ways also the sum will be the same.

9 + 1 = 10

10 + 8 = 18

**Problem Solving**

Question 20.

The zoo has 5 black bears, 5 brown bears and 2 polar bears. How many bears are at the zoo?

____ bears

Answer:

12 bears

Explanation:

The zoo has 5 black bears,

5 brown bears and 2 polar bears.

5 + 5 = 10

10 + 2 = 12

12 bears are at the zoo.

Question 21.

Lisa saw 4 sheep and 4 goats at the petting zoo. She also saw 3 piglets. How many animals did Lisa see at the petting zoo?

____ animals

Write the doubles fact that helped you solve the problem.

____ + ____ = _____

Answer:

4 + 4 = 8

Explanation:

Lisa saw 4 sheep and 4 goats at the petting zoo.

4 + 4 = 8

She also saw 3 piglets.

8 + 3 = 11

11 animals that Lisa see at the petting zoo.

**Write Math** Explain how you can group addends in any way to help you solve addition problems that have more than 2 addends.