Q: How many binary bits are needed to represent decimal number 21?

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231

For the simple reason that the 'places' in a binary number represent multiples of 2, rather than 10. Therefore, a binary '10' = a decimal '2.'

It takes 7 digits.

Every decimal number can be represented by a binary number - and conversely.

Decimal 11 = binary 1011

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The binary number 10000000 represents the decimal 128

231

The binary equivalent for the decimal number 23 is 10111

All I know is that when a number is negative, you convert the decimal into binary and if it is negative you put 1111 before the binary digits.

10111

10 digits.

8

For the simple reason that the 'places' in a binary number represent multiples of 2, rather than 10. Therefore, a binary '10' = a decimal '2.'

If that's binary, it's 57 base 10

It takes 7 digits.

The decimal number 101 is represented by the binary number 1100101.

Every decimal number can be represented by a binary number - and conversely.