Introducing Fractions: More Uses of Fractions
This clip explores additional uses of fractions, such as expressing parts of a whole, representing division, and replacing remainders.
Understanding Decimal Fractions: Reading Decimal Fractions: Using Fractions
This clip explains how to read and say decimals using fractions. It includes an example in which two fractions with different denominators are added. Their sum is expressed with their common denominator in the fraction that results.
Ratio and Proportion: Simplifying the Comparing of Fractions by Cross Multiplying
This clip explains that cross multiplying is a shortcut which allows us to determine if two fractions are the same. The fractions are compared by multiplying the numerator of each by the denominator of the other. If the products are the same, then t...
Ratio and Proportion: Problem In Which The Denominator Is Missing, A
This clip explains that, whether it's a numerator or a denominator that's missing, in order to be sure that "
we really have a proportion...the cross products must be equal."
Ratio and Proportion: Knowing Whether Two Fractions Are Equal
This clip explains that the way to find out whether two fractions are equal is to write them with a common denominator. If the numerators are equal, the fractions will be equal.
Renaming Fractions: Reducing Fractions
This c lip explains the process of renaming fractions in lower terms, which is called "reducing" the fraction. While renaming fractions in higher terms is accomplished by multiplying through, renaming (or reducing) the fraction in lower terms is acc...
Introducing Fractions: Summary: Introducing Fractions
This clip provides a summary of Introducing Fractions. It discusses how and why fractions are used, including for purposes of comparing one quantity with another, as a means by which to express division, and as a way to measure.
Renaming Fractions: Multiplying Through
This clip explains that one way to rename a fraction is to multiply both numerator and denominator by the same non-zero number. This is called multiplying through by the number.
Renaming Fractions: Classes of Fractions
This clip explains that all fractions can be organized into families or classes. For example, the clip continues, 1/2, 2/4, 3/6, 4/8 and 5/10 and so on all belong to the same class. Another example is any fraction whose numerator and denominator are...
Compound Denominate Numbers: Compound Units
This clip presents several practical problems involving compound units. The problems include calculating a car's speed in miles per minute; the number of gallons of gas used; the force per square foot exerted by a waterbed; and the speed of sound ex...