The concept of decimals are presented in grid format to enhance the understanding of decimals. The subtle difference between 0.3 and 0.30 is made approachable to younger pupils of primary school age. The idea of money is used to explaining that. For example, while the former represents 3 ten pence coins, the latter represents 30 one pence coins.
In more advanced way, one may explain it in the following way:
While in 0.3, one is not quite sure whether the digit 3 is the result of rounding up or down, whereas in 0.30, one will have the confidence that it is not.
Another way of looking at it is, that, if these figures were the results of measurements, then, 0.30 is more accurately measured than 0.3
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