Negative Exponents: Summary: Negative Exponents
This clip summarizes the lesson on negative exponents. It explains that when we say 4 to the power of negative 2, it means 1 over 4 to the power of 2. "If we think of the original number as a fraction with a denominator of 1," the clip states, "...w...
Metric System, The: Converting Metric Units: Unit Cancellation and Moving Decimals
This clip explains how to convert metric units using the unit cancellation method, which uses unit equivalences and conversion factors. The clip also points out that moving decimal points is a simple way to convert between metric units, although som...
Metric System, The: Practical Problems in Converting Metric Units
This clip explains how to solve unit conversion problems using the decimal method and the unit cancellation method. Following the final problem, the clip explains that, "Â…both methods of converting centimeters to meters give us the same answer. So ...
Solving an Equation with a Fraction
Most people are more comfortable working with whole numbers than with fractions, so when an equation includes a fraction the first thing to do is get rid of the denominator.
Practical Problem: Two Solutions for a Work Problem
A practical work problem that requires finding out how long it will take two workers with different work speeds to complete a task is solved using an equation with a rational expression. Two different approaches to finding the solution to this probl...
Practical Problem: Two solutions for a Pool Problem
A work problem is presented to determine how long it will take to fill a pool that has an open drain.
Practical Problem: Finding the Speed of the Wind
A practical problem involving two airplanes requires finding their true speed after factoring in wind speed. The rate, time, and distance formula is used to solve the problem.
Metric System, The: Metric Units, Prefixes, Equivalences and Abbreviations
This clip presents the units for length, fluid volume and mass used in the Metric System. The clip also provides some of the key prefixes and abbreviations for Metric System units of measurement, as well as unit equivalences.
Multiplying Fractions: Multiplying Fractions: Three Problems
This clip provides three practical problems to demonstrate when the ability to multiply fractions is useful. One example involves figuring out the area of a park. The clip points out that this type of problem is approached in the same way, regardles...
Multiplying Fractions: Multiplying Fractions With Numerators Other Than One
This clip explains what it calls the basic rule for multiplying fractions, which works for any number of fractions. The clip says to multiply all the numerators to get the numerator of the answer, and to do the same with all the denominators. The pr...