Based on their work with 5.NF.3, 4.NF.1, 4.NF.6, and 6.NS.2&3, should students already know some fractions have decimal representations that terminate in a finite number of digits while others are infinitely repeating? Are students expected to express remainders as decimals in grade 6 and the intent of 7.NS.2d is just to make sense of why some fractions result in terminating decimals and others do not?