All lessons › Unit 2 · Rates and percents

Units, conversion and density

SAT Math questions often ask you to change units before you can finish, like miles to kilometers, hours to minutes or square feet to square yards. One wrong conversion and the answer is wrong.

This lesson shows how to convert units by multiplying by a fraction equal to 1, so you can check the units at every step. Then it covers area units, volume units and density. Animated pictures, a quiz after each part and practice questions help you practice this. Writing the units in every step makes mistakes easy to spot.

In this lesson

• Converting units
• Area units, volume units and density