Simply keep dividing by 2, and make a note of the remainder each time...
249/2 = 124 r 1
124/2 = 62 r 0
62/2 = 31 r 0
31/2 = 15 r 1
15/2 = 7 r 1
7/2 = 3 r 1
3/2 = 1 r 1
1/2 = 0 r 1...
Now - reading from the bottom up you get the binary number 11111001.
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249 - 10% = 249 x (1 - (10/100)) = 249 x 0.9 = 224.1. If the number refers to a unit of currency, don't forget to round to the appropriate number of decimal places and include the appropriate currency unit. Finally the solution of this is 24.1
No. The square root of 249 is not a whole number, therefore it is not a square number.
249 is a composite number because it has factors 3x83.
249 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
As a number it is: 249,000,000