# Adding Doubles Minus 1

## Overview

The **adding doubles** strategy is very helpful and in the previous lesson, we reviewed on **Adding Doubles Plus 1**.

In this lesson, we will apply the same exact strategies and learn how to use the **adding doubles minus 1** to help us quickly solve certain addition problems.

**Incase you forgot what adding doubles is, let’s review!**

When you add **two** of the **SAME** number, you are adding with **DOUBLES FACTS**.

1 + 1 and 2 + 2 are both doubles facts.

Look at the example below:

3 + 3 = 6 is a doubles fact.

Take a look at this special addition problem below, where we can use our knowledge of **doubles fact** and simply **minus 1** to quickly get the answer.

3 + 2 =

We know that 3 + 3 = 6, so 3 + 2 must have a sum that is one less.

Therefore,

3 + 2 =5

Doubles facts are easy to remember. Look at the pattern below.

**Let’s try a few doubles minus 1 facts! Use the pictures to help you solve.**

4 + 3 =

**4 + 4 = 8**, so **4 + 3 = 7**

6 + 5 =

**6 + 6 = 12**, so **6 + 5 = 11**

5 + 4 =

**5 + 5 = 10**, so **5 + 4 = 9**

2 + 1 =

**2 + 2 = 4**, so **2 + 1 = 3**

Remembering the doubles facts can help you with other math problems too!

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### Practice Question 1

**Use the adding doubles minus 1 strategy to solve questions 1 through 5.**

8 + 7 =

### Practice Question 2

5 + 4 =

### Practice Question 3

3 + 2 =

### Practice Question 4

7 + 6 =

### Practice Question 5

5 + 4 =

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