## 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

# Learn

First, let’s find out a bit about the method for adding numbers together using number columns. Watch this short animation featuring a hive of helpful bees from KS2 Maths.

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? 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

# Practise

## Activity 1

Hive maths

Click on the image below to see if you can add the numbers correctly.

## Activity 2

Test your knowledge of three-digit numbers with this worksheet from Twinkl.