NumihanaSubtract tens, then ones.
Split the amount to subtract into tens and ones. Subtract each part in turn. You may cross a multiple of ten when taking away the ones.
When this helps
Useful for two-digit mental subtraction with a non-negative result.
A common slip
Both parts are subtracted. Do not add the ones back.
Worked example
34 − 20 =
What is the tens part of 20?
Use the value of the tens digit.
20What is 34 minus the tens part?
Take away the whole tens first.
14How many ones still need to be taken away?
Use the ones digit of the original number being subtracted.
0What is the final answer?
Recombine your working and check it against the original question.
14
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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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