Signed Fractions: Multiplying Signed Fractions
This clip explains that the freedom to move the negative sign out front makes multiplication of signed fractions exactly like multiplication of any signed numbers.
Mathematics in the Business World
An introduction to the world of business math, rationale for studying the subject and an important look at the value of strong math skills.
Length: Shortcut For Converting Metric Units, A
This clip explains that, instead of using a unit conversion factor to solve a problem, the student can use the decimal method, which the clip calls "a shortcut." "When we convert from metric to U.S. units," the clip notes, "we can use the shortcut b...
Measurement and Unit Conversion: Exercises in Unit Conversion and Cancellation Involving Weeks and Days
This clip presents problems involving the unit equivalence for weeks and days. In the first of these, the clip states that, "
we are converting from 91 days to an equivalent number of weeks
We will convert the units by multiplying two fractions." ...
Mean, Median and Mode: Shortcut for Handling Larger Data Sets, A
This clip explains that many real-life applications of statistics use very large data sets. "Since there are so many values," the clip states, "
and some of the values appear more than once, we'll group the data in a table." The clip concludes by n...
Perimeter: Perimeter, Equilateral Polygons and Rectangles
This clip explains that we can measure the perimeter of an equilateral polygon by multiplying the length of one side by the number of sides in the polygon. The clip also notes that the formula for measuring the perimeter of a rectangle is "perimeter...
Perimeter: Finding the Length of a Semi-Circle
This clip uses practical problems to explain how to find the length of a semi-circle. "The length of the semi-circle is half the length of the circumference," the clip states. "That means, once we know the circumference of a circle, we can find the ...
Perimeter: Circles: Circumference, Radius and Diameter
This clip explores the perimeter of circles. "The distance around a circle is called its circumference," the clip explains. "One way to find the circumference of a circle is to know its diameter." The clip then talks about the use of pi ("
the valu...
Perimeter: Finding Unknown Side of a Rectangle When Perimeter and One Side Are Known
This clip uses practical problems and simple equations to explain how the perimeter formula for rectangles can be used to find the length of an unknown side, when the perimeter and length of one side are known.
Length: Converting Meters to Feet and Kilometers to Miles
This clip presents practical problems in which meters must be converted to feet, and kilometers must be converted to miles. In the first problem, the student must determine how many feet of telephone cord are on a 100-meter roll. "We'll use the deci...