To convert the decimal number 54 into binary (base 2), we need to divide 54 by 2 repeatedly and keep track of the remainders.
54 divided by 2 equals 27 with a remainder of 0.
27 divided by 2 equals 13 with a remainder of 1.
13 divided by 2 equals 6 with a remainder of 1.
6 divided by 2 equals 3 with a remainder of 0.
3 divided by 2 equals 1 with a remainder of 1.
1 divided by 2 equals 0 with a remainder of 1.
Reading the remainders from bottom to top, the binary representation of 54 is 110110.
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54 base 10
200 (base 6) is 2 x 6^2 + 0 x 6^1 + 0 x 6^0 = 2 x 36(base 10) = 72 (base 10).
10 / 2 = 2 can be correct -- if you are working in base 4. 104 is equal to 410, so converted to decimal you have 4 / 2 = 2.
5.4 = 54/10= 10x5+4/10= 54/10= 54÷2/10÷2= 27/5
This would be 7 times 64 (8^2) + 7 times 8 + 7 = 511.