__Objective:__

At the end of this lesson, students should be able to add several two, three and four digit numbers together.

Addition is done using the plus **(+)** sign. The answer we get by adding two numbers is called the **sum**.

__Example 1__

** H T U**

3 4 5

+5 3 4

8 7 9

Start adding from the right side. You add units to units, tens to tens and hundreds to hundreds.

**5 units + 4 units = 9 units**

**4 tens + 3 tens = 7 tens**

**3 hundreds + 5 hundreds = 8 hundreds.**

Write all your answers under the appropriate columns.

__Example 2__

**6** and **5 units** equals **11 units**. 11 units make 1 ten and 1 unit. Write 1 under the units column and carry 1 ten to the tens column. **1+ 8 + 3 tens** make **12 tens**. 12 tens make 1 hundred and 2 tens. Write 2 under the tens column and carry 1 hundred.

**1 + 9 + 4** make **14 hundreds**. 14 hundreds make 1 thousand and 4 hundreds. Write 4 under hundreds column and 1 under the thousands column. Your answer becomes 1421.

__Example 3__

4121 + 580 + 246

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