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If you mean: 7 and 45/100 then it is 7.45 as a decimal
8.7. A decimal point (the period in math) says that it's a decimal. A decimal is a fraction of the whole, expressed with the period and means tenths. So the number given is eight wholes and 7/10 of a whole.
think of it this way any numbers to ther right of the decimal is a whole so 3 wholes 7 thousandths 6 tenths and one unit
3 divided by 7 is:3/7 = 0.428571428 calculating to 9 decimal places.