Add two 3-digit numbers using partitioning
I can add two 3-digit numbers using partitioning.
Add two 3-digit numbers using partitioning
I can add two 3-digit numbers using partitioning.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Partitioning can be used to add 3-digit numbers
- Unitising means we can use known facts to add larger numbers. For example, 370 + 260 is equal to 37 tens add 26 tens.
Keywords
Addend - An addend is a number added to another.
Sum - The sum means the total when the numbers are added together.
Unitising - Unisiting means treating groups that contain the same number of things as 'ones' or 'units'.
Common misconception
Pupils may not understand that a tens counter has a value of ten. For example, they may think that 14 tens and 11 tens make 25 altogether, forgetting to convert 25 tens into 250.
Encourage counting in tens using counters to begin with. Move onto modelling questions using base ten so the children can count the tens blocks.
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
30
300
3
40
500
7
4 ones + 5 ones
40 + 50
400 + 500
32 ones + 54 ones
320 + 540
45 tens + 39 tens
Partitioning
Unitising