NumihanaBridge through a multiple of ten.
Split the amount you are adding so that the first part takes you to the next multiple of ten. Then add what is left. If there is not enough to reach that ten, use the entire amount as the first part.
When this helps
Useful when an addition crosses ten or twenty. If you already start on a multiple of ten, the bridging part is zero.
A common slip
The two parts of the added number must still add to that number. Do not add the bridging part twice.
Worked example
18 + 0 =
How much of 0 can you use to reach 20, or get as close as possible?
Find the gap from 18 to 20, using no more than 0.
0How much is left to add?
Subtract the bridging part from the original added amount.
0Where do you land after the first part?
Add the bridging part to the starting number.
18What is the final answer?
Recombine your working and check it against the original question.
18
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Teaching context
This lesson practises mathematical representations and calculations. The displayed practice uses selected England Year 1 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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