the second resource (not numbered, between (1) and (2)) is to detect those students who fairly routinely prefer to subtract the smaller digit away from the larger in a column; hoping that they might appreciate the error of their ways...
sheets (1) and (2) give particular multiples of 9 and 99 and these are patterns that can be explored further
sheets (3) and (4) involve all the digits, 1 to 9 and then 0 to 9
students can consider how to obtain other examples by swapping some of the digits
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