JavaScript math is weird. What’s the output? True or false?

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Inside the computer, all numbers are stored in the **Binary Number System**.

To keep it simple, it’s the sequence of `bits`

- which are “digits” that can be either `0`

or `1`

.

The number `0.1`

is the same as `1/10`

which can be easily represented as a decimal number. In binary, it will result in an endless fraction, similar to what `1/3`

is in decimal.

All numbers in JavaScript are stored as `64-bit`

signed floating-point values, and when there’s not enough space to hold the value, the least significant digits are rounded.

This leads us to the fact that in JavaScript `0.1 + 0.2`

render `0.30000000000000004`

and not `0.3`

like you would have obviously thought.

There’s a whole lecture dedicated to the **Binary Number System** in my Full Stack JS course
CoderslangJS
.

**ANSWER**: `false`

will be printed on the screen.