All numbers must be entered as decimal numbers. Examples include 5000 or 5e3 or 5.0e3. Do not enter numbers with commas as in "5,000" and not as fractions as in "3/4", and not in percentages as in "25%". That Canvas may reformat your number with commas is not important and not relevant.

Always use nice round numbers for estimates. One significant digit is often enough. Make the numbers easy to multiple and divide in your head. Three significant digits is way too many.

You know a lot from everyday life - learn to use it and trust it.

Be sure to use our useful numbers and handy formulas sheet, and our spiral energy diagram. These are in our "Let's Get Started! " section of the course.

1.Estimate the energy in one gallon of gasoline (in joule).

2.Estimate the energy of one tablespoon of peanut butter (in joule).

3.Estimate the number of tablespoons that is the energy equivalent of 1 gallon of gasoline.

4.Estimate the number of 16 oz jars of peanut butter that is the energy equivalent of 1 gallon of gasoline.