Addition Of Two Three Digit Numbers Quiz for students

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In this quiz, the child has to add two three-digit numbers in a single go such as adding 505 with 423 and the resulting sum has to be answered by filling in the blank. The situation is big as the numbers are big but with practice, things really get to be easier. Through this kid, the child gets to know how good he or she is at adding big numbers and even if they can’t get well with the questions for the attempt, it still shows them how the actual process has to be performed in adding them.

Learn to add two 3 digit numbers

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 two three-digit numbers together.

A three-digit number is a number that has three digits, such as 123, 456, and 789. To add two three-digit numbers 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 456.

We’ll start by aligning the numbers in columns, with the ones digits, tens digits, and hundreds digits lined up.

  123
+ 456
-----

The first column is the ones digits column. We’ll start by adding the ones digits of the two numbers, which are 3 and 6. 3 + 6 = 9, so we write the 9 in the ones digit of the answer and carry over the 1.

  123
+ 456
-----
  9

Next, we move on to the tens digits column. We add the tens digits of the two numbers, which are 2 and 5, and add the 1 that we carried over from the ones digits. 2 + 5 + 1 = 8, so we write the 8 in the tens digit of the answer and carry over the 1.

  123
+ 456
-----
  89

Finally, we move on to the hundreds digits column. We add the hundreds digits of the two numbers, which are 1 and 4, and add the 1 that we carried over from the tens digits. 1 + 4 + 1 = 6, so we write the 6 in the hundreds digit of the answer.

  123
+ 456
-----
  579

And there you have it! The sum of 123 and 456 is 579.

Another example:

Example: Let’s say we want to add the numbers 345 and 876

  345
+ 876
-----

We start adding the ones digit, in this case 5+6=11 so we write 1 in the ones digit of the answer and carry over the 1.

  345
+ 876
-----
   1

We move on to the tens digits, 4+7+1=12 so we write 2 in the tens digit of the answer and carry over the 1

  345
+ 876
-----
  21

Finally we move on to the hundreds digits and add 3+8+1=12 so we write 12 as our answer

  345
+ 876
-----
 1221

As you can see the process is the same as the previous example, with carrying over digits if the sum of any column is greater than 9.

It’s important to practice addition of three 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.