The number 170 as a decimal is simply 170.0. In decimal form, whole numbers are represented with a decimal point and a zero in the tenths place. This is to indicate that the number is a whole number and does not have any fractional parts.
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170
To convert 170% to decimal notation divide by 100: 170% ÷ 100 = 1.7
The binary number 10101010 is equivalent, in decimal representation, to 128 + 32 + 8 + 2 = 170. But this answer assumes that the given number is binary - an assumption for which there is no real justification. Besides, the relationship is an equivalence, which is not quite "the same thing".
When finding the percentage of something, you multiply the decimal equivalent of it by the number that you wish to find the percentage of. So you are saying 0.2 (which is 20% in decimal) times 170. you should get 34
35% of 170= 35% * 170= 0.35 * 170= 59.5