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Adding two-digit numbers using partitioning

Adding two-digit numbers using partitioning worksheet
A teacher-made worksheet to help Year 3 children practise adding two-digit numbers using partitioning.

When adding two two-digit numbers, it is a good idea to add the tens first, then add both the units and finally add the two results. Can you use this method to work out these sums?


Keystage:  KS2, Year 3

What is partitioning in Year 3 maths?

Partitioning is a method used to solve math problems involving large numbers by breaking them down into smaller, more manageable parts. 

Younger children will initially learn to divide these numbers into individual units, allowing them to add these smaller segments together. Older children can isolate all the tens and work down to the single units, simplifying the problem step by step. This approach helps make complex calculations much easier for young learners to handle.

What is an example of addition using the partitioning method in Year 3?

Let's use the sum 47 + 35

First, we break down each number into tens and units.

  • 47 = 40 + 7
  • 35 = 30 + 5

Then we add the tens of each number together.

  • 40 + 30 = 70

Now, add the units of each number together.

  • 7 + 5 = 12

Finally, combine the results. 

  • 70 + 12 = 82

How will this partitioning worksheet help your Year 3 child?

This activity was created by an experienced educator with the purpose of refreshing and consolidating your child's knowledge of how to add two-digit numbers using the partitioning method. Your child will be guided through the steps and then asked to apply their knowledge and answer questions on their own. 

For more help with Year 3 maths, check out our hub page, or try a new activity such as Year 3 problem solving: addition.