The smallest number that should be subtracted from 21.45 to give a prime number is
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First find the square root of 300…
It is 10 times the square root of 3.
If you don’t know the square root of 3 (about 1.7), you know that it’s smaller than the square root of 4, which is 2, and higher than 1.
15*15 = 225, so sqrt(3) is higher than 1.5
16*16 = 2^8 = 256 (number of combinations with 8 bits = 1 byte)
17^2 = ( 15+2)(15+2) = 225 +60 + 4 = 289
18^2 = 9^2 * 4 = 81*2*2= 162*2 = 324
So, the highest square lower than 300 is 17^2
300 - 289 = 11
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