Now we will consider the four basic operations with whole numbers: addition, subtraction, multiplication, and division.


Adding Whole Numbers

Addition means putting things together. The numbers to be added are called the addends. The total is called the sum.  The digits are aligned in columns to ensure that like terms are added. First we add all the numbers in the ones place, then we add all the numbers in the tens place, and so on. Example:






You will need to carry a number whenever the sum of the addends is greater than nine. Example:






Usually, we write the numbers in a column format with ones, tens, hundreds, etc. aligned, then add each column beginning with the ones, and carry-over digits to the left.







Addition Concept

What is Addition

Adding Whole Numbers 1

Adding Whole Numbers 2

Adding Whole Numbers 3

Rounding Whole Numbers

Estimating sums of Whole Numbers

Properties of Addition

The Associative Property of Addition




Word Problems – Using Whole Numbers 

Word problems vocabulary

WN01  Place_Value

WN02  Round

WN04  Add_Integers

WN05  Whole Numbers Addition

WN06  Missing_Addends


Write your own word problem:

Word problem Writing Template

Problem Solving Format

Properties of addition