Andy’s savings account pays 0.3% more interest than Marty’s. What is 0.3% written as a decimal number?

.0003

Explanation:

0.3% = 0.003 in decimal form. Percent means 'per 100'. So, 0.3% means 0.3 per 100 or simply 0.3/100. If you divide 0.3 by 100, you'll get 0.003 (a decimal number).

the number of calories in each pack of cookies has a greater variation than the number of calories in each pack of crackers.