A strategic way of understanding column subtraction...
Setting out subtraction into columns requires knowledge of place value.
Find out how to develop the strategy of decomposition in column subtraction.
When subtracting numbers in columns, it is often difficult to understand why digits are exchanged from tens to units, hundreds to tens and so on. This video demonstrates the commonly used strategy of decomposition. Allowing quick column subtraction to be fully understood.
BBC Bitesize tips and written info on column subtraction.
A selection of many basic column subtraction worksheets.
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