Add two 3-digit numbers
In this lesson, you will learn how to add two three-digit numbers together.
This lesson includes:
- one quiz
- one learning summary
- one video
- two practise activities
Check your knowledge of adding two 3-digit numbers together in this quiz. Get your pen and paper handy and try using the column method.
There are a few things you should always do when adding large numbers together:
- 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?
What is 343 + 329?
If the two numbers in a place value column add up to a number greater than 9, you must carry a digit.
One apple tree has 178 apples. Another has 253 apples. How many apples are there altogether?
You can use the column method to solve this problem.
Click on the image below to see if you can add the numbers correctly.
On a piece of paper, and using the column method, try to work out the following:
258 + 351
541 + 639
745 + 362
Play Guardians: Defenders of Mathematica to learn more and sharpen your skills on this topic.
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