**Introduction:**

In this session, we are going to learn the subtraction of numbers using the help of addition facts.

Use addition to help you subtract.

8 – 6 =?

6 + __ = 8

What can I add to 6 to make 8?

6, 7, 8

6 + 2 = 8

The missing part is 2.

Think of addition fact to solve the subtraction equation.

So, 8- 6 = 2

## Think Addition to Subtract:

**Example 1: **

Think of addition to help you subtract. Draw the missing part, then write the missing numbers.

**Sol: **

You can use addition to help you subtract.** **

4 + ___ = 5

What can I add to make 4 to make 5?

4, 5

4 + 1 = 5

The missing part is 1.

Think of the addition fact to solve the subtraction equation.

5 – 4 = 1

**Example 2:**

David has 8 crayons in a box. There are 5 crayons still in the box. How many crayons does he take out?

**Sol:**

David has crayons in a box = 8

Number of crayons still in the box = 5

How many crayons does he take out?

8 – ____ = 5

What additional facts can we use to solve this problem?

____ + ____ = _____

What can I add to 5 to make 8?

5, 6,7, 8

5 + 3 = 8

Think of the addition fact to solve the subtraction equation.

8 – 3 = 5

3 crayons he takes out.

#### Exercise

- Think of addition to help you subtract. Draw the missing part. Then write the missing numbers.

2. How can an addition fact help you to solve 5 – 4?

3. Which addition facts can help you solve 7 – 2?

Choose two that apply.

- 5 + 2 = 7
- 2 + 5 = 7
- 3 + 4 = 7

4. Write the missing numbers.

5. Draw the missing part.

6. Draw the missing part. Then write the missing numbers.

7. Write the missing numbers.

8. Vicky needs 6 tickets for a ride. He has 3 tickets. How many tickets do Vicky still need?

9. A part is missing in the equations and model. Find the missing part.

10. Draw the missing part

#### Concept Map:

#### What We Have Learned

- Use addition facts to solve subtraction problems

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