32.346 = (3 x 10) + (2 x 1) + (3/10) + (4/100) + (6/1000)
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0.84 = (0 x 1) + (8/10) + (4/100)
75.00 is how you write it in decimals
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.
640 written in expanded form using exponents is (6 x 10^2) + (4 x 10^1) + (0 x 10^0)
If you can completely write a number, using digits, fractions and decimals, then the number is rational. You appear to have accomplished that.