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42 in Binary

What is 42 in binary? Below we show you the result of the decimal to binary conversion straightaway 🙂

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If you want to know how to convert the number please read the instructions on the homepage.

4210 = 1010102
Decimal 42 = 101010 Binary

Any integer can be written as sum of potencies to the power of 2, known as binary code.

Here’s the proof that 101010 is the correct result:

1×2^5 + 0x2^4 + 1×2^3 + 0x2^2 + 1×2^1 + 0x2^0 = 42

Yet, make sure to learn about 42 in binary signed in the next section.

If you like to know the base-2 numeric system equivalent for any other decimal please use our converter above.

Similar conversions on this web site include:

Convert 42 to Binary

Now you already know the most important thing:

10101010 equals 422 if unsigned.

If 42 in binary is signed such as with two’s complement, then the binary code has a number of trailing zeroes, e.g. 000101010 in which the leftmost bit is the sign bit, followed perhaps by more trailing 0’s, and then by magnitude bits.

The reason to have the binary signed is to accommodate for negative numbers, in which case the sign bit is 1 in our example.

Therefore, minus 42 signed using two’s complement, will start with one or more 1’s, but the exact code for -42 decimal depends on the signed number representation system and number of bits available.

Here you can convert binary to decimal.

Additional Information

If you like to know what decimal 42 is on other number systems, we have that too:

42 in Hexadecimal = 2A16
42 in Octal = 528

Summary

42 in binary form is 101010 usually, that is if not signed.

If you want to know more about signed number representations look it up on Wikipedia for example.

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– Article written by Mark, last updated on December 19th, 2023