basic mathematics image
 basic mathematics image

Adding whole numbers



Adding whole numbers is what this lesson will teach you. Also there is a calculator to help you practice.Adding whole numbers means that we are combining numbers to form a total.



Each number being added is called an addend and the total, which is the answer to the addition problem is called sum.

addend-image

Adding numbers with 1 digit is pretty straightforward. In general, you can do it mentally or use your fingers. Adding zero to a number never changes the number

Take a close look at the following addition problems.

addition-image


The answer for one of them is wrong. Can you tell which one?

You got it right! It is the first one. 4 + 6 is not equal to 11.

4 + 6 = 10.

Now, let us move on to something more interesting, adding numbers with two digits.

When adding two-digit numbers, add the ones first. Then, add the tens.

Let us try to add 36 to 17 using expanded notation

36 = 30 + 6 and 17 = 10 + 7

adding the ones ( 6 and 7) gives 13 and 13 = 10 + 3

Adding the tens (30, 10, and 10) gives 50 and 50 + 3 = 53


Let us add 58 to 46

58 = 50 + 8 and 46 = 40 + 6

Adding the ones (8 and 6 ) gives 14 and 14 = 10 + 4

Adding the tens (50, 40, and ,10) gives 100 and 100 + 4 = 104

We can accomplish the same by arranging the numbers in vertical columns as shown below

adding-demonstration-image


In the above, we add the ones column first. Then, we carry over the tens to the tens column. The 1 that we carry over has a place value of 10. However, there is no need to write 10 because as we saw before in place value putting a 1 here in the tens place means that there is 1 ten.

Use the addition calculator to practice


Enter your first number:       

Enter your second number:

       

The result is :  







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