# Add two 3 or 4-digit numbers together

## Learning focus

Learn how to add a three or four-digit number to another three or four-digit number.

This includes:

• one video

• two slideshows

• two activity sheets

# Learn

First, let's recap on the basic method for column addition with this video from KS2 Maths.

## Checklist

• 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? Start from the ones column: 3 + 9 = 12, place a 2 in the ones column and carry 10 to the tens column by placing a 1 below1 of 4 In the tens column: 40 + 20 + 10 = 702 of 4 In the hundreds column: 300 + 300 = 6003 of 4 The finished sum - 6724 of 4

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?

# Practise

## Activity 1

Can you complete the questions in this worksheet from Collins? If you don't have a printer, you could write the answers down in a workbook.

## Activity 2

You could also try this worksheet from Twinkl.

Check here for the answer sheet