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It is not a matter of aligning the decimal points, but aligning the place value columns so that the ones are under each other, the tens are under each other, the tenths are under each other, etc which is the proper way to subtract. As the decimal points are between the ones and tenths columns, with those place value columns aligned, the decimal points are aligned.Aligning the decimal points is an easy way to remember to align the place value columns, as with the decimal points aligned all the place value columns are automatically aligned.
Nine and nine tenths in decimal form is 9.9
the decimal for nine seventeenths = 0.52949/17:= 9 ÷ 17= 0.5294 in decimal
nine decimal 4
9 and 9/10 as a decimal is 9.9