A2 1/2m board is to be used for making shelves, each using up 5/6m of board. does he have enough board left to make another shelf requiring 4/5m? explain

I dont think so because if you multiply 2 1/2 by 5/6 you would get 2 1/12 which means that you can make the first shelf but you would need to subtract 2 1/2 minus 2 1/12 and you would get 5/12. And 5/12 is not the same as 4/5

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