Any fraction which, in its simplest form, has a denominator which has any factor other than 1, 2 or 5.
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Make them into decimals. Make them into decimals.
Yes, aside from 0 or anything 9 divides evenly into
In theory, infinite, non-recurring decimals can represent irrational number whereas fractions cannot do that. However, any non-recurring decimal number can be expressed for only a finite number of digits and so this theoretical difference cannot be attained in reality.
Yes providing you change the fractions into decimals or change the decimals into fractions
No. Recurring decimals are rational numbers.