Add two numbers up to three digits

Key notes:

What Does It Mean?

Adding two numbers up to three digits means you can add any numbers from 1 to 999 together. For example:

• 123 + 456
• 78 + 234

Steps to Add Two Numbers

Step 1: Write the numbers one below the other.
Make sure to line up the ones, tens, and hundreds places.

Example:

• 245

• 132

Step 2: Start adding from the right (ones place).
Add the digits in the ones place. If the sum is 10 or more, write the ones digit and carry over the tens digit.

Step 3: Move to the tens place.
Add the digits in the tens place, including any number you carried over.

Step 4: Add the hundreds place.
Add the digits in the hundreds place, including any carry over.

Example Problem

Let’s add 245 + 132:

245 + 132 ——

• Ones: 5 + 2 = 7
• Tens: 4 + 3 = 7
• Hundreds: 2 + 1 = 3

So, 245 + 132 = 377

Practice Problems

Try these on your own:

• 123 + 234 = ___
• 456 + 321 = ___
• 678 + 210 = ___

Tips

• Always start adding from the right.
• Remember to carry over if the sum is 10 or more.
• Double-check your work!

Learn with an example

Let’s practice!