When using a place value column to subtract two large numbers, sometimes the second number will be larger than the first. This means it cannot be directly subtracted. You need to exchange a digit ...
The first example is a normal subtraction, while the second requires regrouping. Subtract 5∙1 from 9∙6. Write the larger number (9∙6) above the smaller number (5∙1) in a vertical list ...
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