The Meaning of Percentage: Very Small Percentages
This clip explains how to deal with very small percents, such as those less than 1 percent. As an example, it uses one-fourth percent, which it states is one quarter of 1%. The clip then goes through the steps necessary to express that in decimal fo...
Negative Exponents: Division Involving Negative Exponents
This clip explains that, when it comes to division involving negative exponents, if the bases are the same, we just subtract exponents. The clip illustrates this rule with a number of examples including 4 to the power of 9 divided by 4 to the power ...
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, "
both methods of converting centimeters to meters give us the same answer. So ...
Multiplying Signed Numbers: Multiplying Negative Numbers by Negative Numbers
This clip explains that when a negative number is multiplied by another negative number, the product is actually positive.
Metric System, The: Unit Conversion: Mass
This clip explains how to convert metric units of mass by marking the decimal and then moving it, using the larger left rule in one case, and the smaller right rule in another.
Multiplying Fractions: Multiplying Fractions and Canceling
This clip explains that, "
.when we multiply together two or more fractions, and the same number appears in a numerator and a denominator
we are allowed to divide through or 'cancel' in both places." The clip concludes by stating that, "
if you d...
Metric System, The: Solving Conversion Problems: The Decimal Method and the Unit Cancellation Method
This clip explains how to solve unit conversion problems using the decimal method and the unit cancellation method. The clip points out that, "
the advantage of unit cancellation is that you're not likely to make mistakes with decimals. The advanta...
Measurement and Unit Conversion: Problem Involving Time and Light Bulbs, A
This clip presents a practical problem that involves predicting how frequently light bulbs will need to be replaced. The solution includes unit equivalences for converting hours to days and days to weeks.
Measurement and Unit Conversion: Unit Conversion Factors of Time: Hours, Minutes and Seconds
This clip presents unit conversion problems involving sleep that can be solved by utilizing unit equivalences for seconds to minutes and minutes to hours, and then either multiplying or dividing.
Measurement and Unit Conversion: Unit Conversion Factors of Time: Days and Hours
This clip introduces unit conversion factors of time involving days and hours. "It is not important to memorize these factors," the clip explains. "As long as you already know the equivalences, you can figure out the unit conversion factors." The cl...