Question

multiple-choice question where do you stop and place the decimal? when you have 1 number (not a zero) to the left of the decimal. when you get to a non zero number

Explanation:

Scientific notation requires a single non-zero digit to the left of the decimal point, which means you stop at the first non-zero number when converting a small decimal value. The first option correctly states this rule, while the second is incomplete (it doesn't specify the single digit requirement).

Answer:

When you have 1 number (not a zero) to the left of the decimal.