# How do you write 1 in scientific notation?

$1 = 1.0 \times {10}^{0}$ (in scientific notation)
Scientific notation requires that the mantissa (the first part) be written with a single non-zero digit to the left of the decimal point (unless the number is zero) multiplied by $10$ with an exponent indicating how many positions the decimal point needs to be moved to the right (left if the exponent is negative) to get the "standard notation" value.
$1 = 1.0$
In this case the decimal point does not need to be moved (either direction), so the exponent is $0$.