Adding and subtracting 3-digit numbers

Do you know how to add or subtract3-digit numbers? Learn it with this lesson!


If you want to add or subtract 3-digit numbers, the process is always the same.

First, you add or subtract units, then tens and hundreds.

And don't forget the remainders!

Table of contents of this lesson: Adding and subtracting 3-digit numbers

Learn FREE with videos and interactive exercises

Adding 3-digit numbers

Let's learn how to add 3-digit numbers together.

First, you have to add the units, then the tens and the hundreds.

Use an abacus if you need help.

What is 137 + 251? Look at the picture and solve the addition!

Subtracting 3-digit numbers

Subtracting 3-digit numbers