All the solutions provided in **McGraw Hill My Math Grade 1 Answer Key PDF Chapter 3 Lesson 1 Count On 1, 2, or 3 **will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 1 Answer Key Chapter 3 Lesson 1 Count On 1, 2, or 3

**Explore and Explain**

Answer:

Explanation:

I drew a group of 4 crayons

Then, I drew 2 more crayons

The addition number sentence that tells how many in all is 4 + 2 = 6.

**Teacher Directions:** Draw a group of four crayons. Then draw 1, 2, or 3 more crayons. Write an addition number sentence that tells how many in all.

**See and Show**

You can count on to add. There are 5 crayons in the group. Add 2 more crayons.

**Helpful Hint**

Start with the greater number, 5. Count on 2 more. 5, 6, 7

5 + 2 = 7

**Use Start with the greater number. Count on to add.**

Question 1.

Answer:

Explanation:

Started with the greater number, 7

I Counted on 3 more. 8, 9, 10

So, 7 + 3 = 10.

Question 2.

Answer:

Explanation:

Started with the greater number, 6

I Counted on 2 more. 7, 8

So, 7 + 2 = 8.

**Talk Math** Tell how to count on to add 5 + 3.

Answer:

Start at 5

Count by 1’s

Count on 3 more

5 after 6, 7, 8

So, 5 + 3 = 8.

**On My Own**

**Start with the greater number. Count on to add.**

Question 3.

5 + 3 = _____

Answer:

8

Explanation:

Started with the greater number, 8

I Counted on 3 more. 6, 7, 8

So, 5 + 3 = 8.

Question 4.

8 + 3 = _____

Answer:

11

Explanation:

Started with the greater number, 8

I Counted on 3 more. 9, 10, 11

So, 8 + 3 = 11.

Question 5.

4 + 1 = ____

Answer:

5

Explanation:

Started with the greater number, 4

I Counted on 1 more. 5

So, 4 + 1 = 5.

Question 6.

1 + 2 = _____

Answer:

3

Explanation:

Started with the greater number, 2

I Counted on 1 more. 3

So, 1 + 2 = 3.

Question 7.

9 + 3 = ____

Answer:

12

Explanation:

Started with the greater number, 9

I Counted on 3 more. 10, 11, 12

So, 9 + 3 = 12.

Question 8.

1 + 8 = ____

Answer:

9

Explanation:

Started with the greater number, 8

I Counted on 1 more. 9

So, 1 + 8 = 9.

Question 9.

3 + 7 = ____

Answer:

10

Explanation:

Started with the greater number, 7

I Counted on 3 more. 8, 9, 10

So, 3 + 7 = 10.

Question 10.

2 + 9 = ____

Answer:

11

Explanation:

Started with the greater number, 9

I Counted on 2 more. 10, 11

So, 2 + 9 = 11.

Question 11.

1 + 7 = ____

Answer:

8

Explanation:

Started with the greater number, 7

I Counted on 1 more. 8

So, 1 + 7 = 8.

Question 12.

4 + 3 = ____

Answer:

7

Explanation:

Started with the greater number, 4

I Counted on 3 more. 5, 6, 7

So, 4 + 3 = 7.

Question 13.

2 + 7 = ___

Answer:

9

Explanation:

Started with the greater number, 7

I Counted on 2 more. 8, 9

So, 2 + 7 = 9.

Question 14.

5 + 1 = ___

Answer:

6

Explanation:

Started with the greater number, 5

I Counted on 1 more. 6

So, 5 + 1 = 6.

Question 15.

Answer:

Explanation:

Started with the greater number, 8

I Counted on 2 more. 9, 10

So, 8 + 2 = 10.

Question 16.

Answer:

Explanation:

Started with the greater number, 6

I Counted on 1 more. 7

So, 1 + 6 = 7.

Question 17.

Answer:

Explanation:

Started with the greater number, 9

I Counted on 1 more. 10

So, 9 + 1 = 10.

Question 18.

Answer:

Explanation:

Started with the greater number, 6

I Counted on 3 more. 7, 8, 9

So, 3 + 6 = 9.

Question 19.

Answer:

Explanation:

Started with the greater number, 5

I Counted on 2 more. 6, 7

So, 2 + 5 = 7.

Question 20.

Answer:

Explanation:

Started with the greater number, 3

I Counted on 2 more. 4, 5

So, 3 + 2 = 5.

**Problem Solving**

Question 21.

Bella sees 2 buses. Then she sees 3 more buses. How many buses does she see in all?

____ buses

Answer:

5 buses

Explanation:

Bella sees 2 buses

Then she sees 3 more buses

Started with the greater number, 3

I Counted on 2 more. 4, 5

2 + 3 = 5

So, Bella sees 5 buses in all.

Question 22.

Jake saw 5 cars in the morning. He saw 3 more cars in the evening. How many cars did Jake see in all?

____ cars

Answer:

8 cars

Explanation:

Jake saw 5 cars in the morning

He saw 3 more cars in the evening

Started with the greater number, 5

I Counted on 3 more. 6, 7, 8

5 + 3 = 8

So, Jake sees 8 cars in all.

**Write Math** Explain how you count on to find 3 + 7.

____________________

____________________

____________________

Answer:

3 + 7 = 10

Explanation:

Started with the greater number, 7

I Counted on 7 more. 8, 9, 10

So, 3 + 7 = 10.

### McGraw Hill My Math Grade 1 Chapter 3 Lesson 1 My Homework Answer Key

**Practice**

**Start with the greater number. Count on to add.**

Question 1.

7 + 2 = ___

Answer:

9

Explanation:

Started with the greater number, 7

I Counted on 2 more. 8, 9

So, 7 + 2 = 9.

Question 2.

4 + 3 = ____

Answer:

7

Explanation:

Started with the greater number, 4

I Counted on 3 more. 5, 6, 7

So, 4 + 3 = 7.

Question 3.

5 + 3 = ___

Answer:

8

Explanation:

Started with the greater number, 5

I Counted on 3 more. 6, 7, 8

So, 5 + 3 = 8.

Question 4.

6 + 1 = ___

Answer:

7

Explanation:

Started with the greater number, 6

I Counted on 1 more. 7

So, 6 + 1 = 7.

Question 5.

9 + 1 = ____

Answer:

10

Explanation:

Started with the greater number, 9

I Counted on 1 more. 10

So, 9 + 1 = 10.

Question 6.

2 + 5 = ____

Answer:

7

Explanation:

Started with the greater number, 5

I Counted on 2 more. 6, 7

So, 2 + 5 = 7.

Question 7.

8 + 3 = ___

Answer:

11

Explanation:

Started with the greater number, 8

I Counted on 3 more. 9, 10, 11

So, 8 + 3 = 11.

Question 8.

7 + 1 = ___

Answer:

8

Explanation:

Started with the greater number, 7

I Counted on 1 more. 8

So, 7 + 1 = 8.

**Start with the greater number. Count on to add.**

Question 9.

Answer:

Explanation:

Started with the greater number, 6

I Counted on 3 more. 7, 8, 9

So, 3 + 6 = 9.

Question 10.

Answer:

Explanation:

Started with the greater number, 8

I Counted on 2 more. 9, 10

So, 8 + 2 = 10.

Question 11.

Answer:

Explanation:

Started with the greater number, 8

I Counted on 1 more. 9

So, 1 + 8 = 9.

Question 12.

Answer:

Explanation:

Started with the greater number, 9

I Counted on 3 more. 10, 11, 12

So, 3 + 9 = 12.

Question 13.

Answer:

Explanation:

Started with the greater number, 6

I Counted on 2 more. 7, 8

So, 6 + 2 = 8.

Question 4.

Answer:

Explanation:

Started with the greater number, 9

I Counted on 2 more. 10, 11

So, 9 + 2 = 11.

Question 15.

Drew went to basketball practice 3 times this week. He went to soccer practice 2 times this week. How many practices did he go to in all?

____ practices

Answer:

5 practices

Explanation:

Drew went to basketball practice 3 times this week

He went to soccer practice 2 times this week

Started with the greater number, 3

I Counted on 2 more. 4, 5

3 + 2 = 5

So, Drew went to 5 practices in all.

Vocabulary Check

**Circle the missing word.**

count on sum

Question 16.

You can ________ to add when you join any number with 1, 2, or 3.

Answer:

count on

Explanation:

You can count on to add when you join any number with 1, 2, or 3.

**Math at Home** Say a number between 1 and 9. Ask your child to add 1, 2, and 3 to that number.

Answer:

Let the number be 5

5 + 1 =

Started with the greater number, 5

I Counted on 1 more. 6

5 + 1 = 6

5 + 2 =

Started with the greater number, 5

I Counted on 2 more. 6, 7

5 + 2 = 7

5 + 3 =

Started with the greater number, 5

I Counted on 3 more. 6, 7, 8

5 + 3 = 8.