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21 over 40 means that there are twenty one fortieths of a whole. Because there is one fortieth in that fracture it cannot be reduced to another fracture. 20/40 could be simplified into 1/2 because 20 is half of 40. But because it is twenty ONE, it must remain 21/40. The only way to simplify it that I know of would be to make it a decimal number. If you were to convert it to a decimal it would be .525 (21 divided by 40 is .525)

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15y ago

What else can I help you with?