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# Doubles Near Doubles

Sep 27, 2022

## Key Concepts

• Doubles Fact
• Near Doubles Fact

## Introduction

### Doubles

To get a double of a number, we add the same number to itself.

For example, double of 3 is 3 + 3 = 6.

Example 1:

Jenny has 4 marbles and she has bought 4 more new marbles. How many marbles does Jenny have?

Solution:

The double of 4 is 8.

### Doubles fact

Example 2:

Find 5 + 5.

Solution:

Let’s take some cubes to solve this.

Doubles fact: 5 + 5 = 10

Example 3:

Find 9 + 9.

Solution:

Let’s take some cubes to solve this.

Doubles fact: 9 + 9 = 18

### Near doubles fact

When adding numbers that follow each other, use the knowledge of doubles to help add the numbers.

3 + 4 is same as 3 + 3 + 1 = 7

Example 4:

Find 4 + 5.

Solution:

Double fact: 4 + 4 = 8

4 + 5 is one more than 4 + 4.

Near Doubles fact: 4 + 5 = 9

Example 5:

Find 10 + 8.

Solution:

Double fact: 8 + 8 = 16

10 + 8 is two more than 8 + 8.

Near Doubles fact: 10+ 8 = 18

## Exercise

1. Complete the doubles fact. Use cubes if needed.
8 + 8 = ______
2. Choose all the pictures that represent a double.
1. Complete the doubles fact. Use cubes if needed.
2 + 2 = ______
2. Complete the doubles fact. Use cubes if needed.
5 + 5 = ______
3. Complete the doubles fact. Use cubes if needed.
10 +10 = ______
4. Use the doubles facts and solve the near doubles. Use cubes if
needed.
3 + 2 = ______
5. Use the doubles facts and solve the near doubles. Use cubes if
needed.
5 + 6 = ______
6. Use the doubles facts and solve the near doubles. Use cubes if
needed.

### What have we learned

• Use Doubles fact and add two numbers that are the same.
• Use Near Doubles fact and add two numbers that follow each other.

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