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0.42 42/100 4.2 x 10^-1 42%
MMMCCLXXIV = 1000 + 1000 + 1000 + 100 + 100+ 50 + 10 + 10 -1 + 5 = 3274
M = 1000 X = 10 I before X means subtract → MMXIX = 1000 + 1000 + 10 - 1 + 10 = 2019
M = 1000 D = 500 C = 100 X = 10 I before X means subtract 1 → MDCXXIX = 1000 + 500 + 100 + 10 + 10 + -1 + 10 = 1629
Because computers are binary - meaning they represent all numbers using only two digits - the closest they can get to expressing 1000 in a nice rounded number is 1024 which is 2 raised to the 10th power (2^10). Written in binary, this number is 10000000000. Of course computers can represent the base 10 number 1000 but it's not as nice and neat. In binary, the base 10 number 1000 is written 1111101000.