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Column addition with or without carrying, subtraction with borrowing, multiplication by one, two or three digits, long division with or without remainders, and order of operations. Laid out the way schools write them, with an answer key that shows the working. A4 or US Letter.
Start with no carrying, then some, then always: three sheets of the same sum, a step harder each time. New set makes another sheet whenever you need one.
Ten questions at the start of a lesson show which step slips: the carrying, the borrowing or the times table behind a division.
The answer key shows every step of a long division and every partial product, so a pupil can find exactly where their working went wrong.
Squares behind each sum keep the columns straight, as a squared exercise book does; switch them off for a plain worksheet.