234=(1)128+(1)64+(1)32+(0)16+(1)8+(0)4+(1)2+(0)1: 111010102
0.365 = (0).5 + (1).25 + (0).125 + (1).0625 + ... = 0.0101...2
1.11010100101110101110000101..._2×27 (see link)
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489 = 111101001
If you use Windows, you can use the Windows calculator to convert from decimal to binary. Change to scientific mode, be sure the calculator is in decimal, type the decimal number, and switch to binary. If you are practicing decimal to binary conversion, this is a great tool to verify that you have done your calculations correctly.
Every decimal number can be represented by a binary number - and conversely.
Decimal 11 = binary 1011
There is no decimal number for the binary number 13 because 13 cannot be a binary number.