Very small numbers are converted to an equivalent decimal number between 1 and 10, multiplied by 10 raised to some negative power. In this example scientific notation calculation we're solving 1.225 × 10 5 + 3.655 × 10 3 : 1.225 × 10 5 +

Significant figures, or sig figs for short, are the meaningful digits in a number. Often, leading zeroes or trailing zeroes can be removed and the number remains just as accurate (004 means