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101 in Decimal

Binary 101 equals 5 in decimal.

101 in all number bases

Decimal5
Hexadecimal0x5
Binary0101
Octal5

How 101 converts from binary to decimal

Multiply each digit by 2 raised to its position (starting at 0 from the right), then add the results:

1× 22 = 1 × 4 = 4
0× 21 = 0 × 2 = 0
1× 20 = 1 × 1 = 1

Sum: 5