Add two 3 or 4-digit numbers together
Home learning focus
In this lesson, you will learn how to add a three or four-digit number to another three or four-digit number.
This lesson includes:
two activity sheets
- When writing down sums, separate the numbers into ones, tens, hundreds and thousands.
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 - for example, 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.
The column method 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?
Can you work out how this method might be used to add two 4-digit numbers together? Why not think of two 4-digit numbers and give it a go?
There's more to learn
Have a look at these other resources around the BBC and the web.