Add 3 To 2 Digit Numbers Math quiz exercise
Adding three digit to two digit number
Addition is an important mathematical operation that is used to find the sum of two or more numbers. In this lesson, we’ll be learning how to add a three-digit number and a two-digit number together.
A three-digit number is a number that has three digits, such as 123, 456, and 789. A two-digit number is a number that has only two digits, such as 12, 34, and 56. To add a three-digit number and a two-digit number together, we use a process called column addition.
Column addition is a method of adding numbers by aligning them in columns and adding them up one column at a time. Let’s look at an example to see how it works.
Example: Let’s say we want to add the numbers 123 and 45.
We’ll start by aligning the numbers in columns, with the ones digits, tens digits, and hundreds digits lined up.
123
+ 45
-----
The first column is the ones digits column. We’ll start by adding the ones digits of the two numbers, which are 3 and 5. 3 + 5 = 8, so we write the 8 in the ones digit of the answer.
123
+ 45
-----
168
Next, we move on to the tens digits column. We add the tens digits of the two numbers, which are 2 and 4. 2 + 4 = 6, so we write the 6 in the tens digit of the answer.
123
+ 45
-----
168
Finally, since there is no carry over and the sum of ones and tens digit are less than 10 we just take the 1 from 123 as our answer
123
+ 45
-----
168
And there you have it! The sum of 123 and 45 is 168.
Another example:
Example: Let’s say we want to add the numbers 345 and 78
345
+ 78
-----
We start adding the ones digit, in this case 5+8=13 so we write 3 in the ones digit of the answer and carry over the 1.
345
+ 78
-----
3
We move on to the tens digit, in this case 4+7+1=12 so we write 2 in the tens digit of the answer and carry over the 1
345
+ 78
-----
23
Finally we move on to the hundreds digits and add 3+1=4 so we write 4 as our answer
345
+ 78
-----
423
As you can see the process is the same as adding three digit to one digit numbers. The only difference is that we have to add the digits of the tens column as well.
It’s important to practice addition of three digit numbers and two digit numbers to become more proficient in math. Also if you are struggling with carrying over or if you are making mistakes it can be useful to go back and practice single digit addition and the concept of carrying over.
Don’t forget that when adding any two numbers together, the process of carrying over is necessary when the sum of any column is greater than 9. Make sure to line up the digits in columns and add them one column at a time. Keep practicing, and you’ll become an addition pro in no time!