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.
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.
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
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.
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