Adding three-digit numbers
Home learning focus
In this lesson, you will learn how to add three-digit numbers together.
This lesson includes:
- two videos
- one online activity
- two activity sheets
When writing down sums, separate the numbers into ones, tens and hundreds. List the numbers in a column and always start adding with the ones first.
- Estimate first and check afterwards - it's a good idea to estimate a rough answer first and then check your actual answer.
- Order doesn't matter - remember that 345 + 129 is the same as 129 + 345.
- Key words - look out for these words in problems: total, sum, altogether, more. They all indicate an addition calculation.
Numbers can be added together using the column method which involves writing one number underneath the other.
What is 343 + 315?
If the two numbers in a place value column add up to a number greater than 9, you must carry a digit.
What is 343 + 329?
Click on the image below to see if you can add the numbers correctly.
Three-digit numbers game
Put your knowledge of three-digit numbers through its paces with this fun active learning game from Move & Learn.
All you need is a pack of playing cards, some paper, a pen and a container.
There's more to learn
Have a look at these other resources around the BBC and the web.