NumihanaAdd tens, then ones.
Partition the second number into its tens and ones. Add the tens first, then add the ones. The size of the total change stays the same.
When this helps
Useful for two-digit mental addition. Regrouping can happen when you add the ones.
A common slip
A 3 in the tens position contributes 30, not 3.
Worked example
86 + 2 =
What is the tens part of 2?
Multiply the tens digit by ten.
0What is the ones part of 2?
The ones part is what remains after removing the tens.
2What is 86 plus the tens part?
Keep the ones of the starting number while adding the tens.
86What is the final answer?
Recombine your working and check it against the original question.
88
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Teaching context
This lesson practises mathematical representations and calculations. The displayed practice uses selected England Year 2 skills; the strategy can also help learners in other years.
Curriculum alignment describes the mathematical skill. It does not mean this is the only required teaching method.
Department for Education: mathematics programmes of study ↗Original method lesson v1.
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