The Meaning of Percentage: Percentage Provides An Easy Way to Compare Fractions
This clip explains that using percent to express values provides an easy means by which to compare fractions. The clip notes that, since there's a common denominator of 100, all that's needed to compare fractions expressed as a percent is to compare...
Understanding Decimal Fractions: Why Use Decimal Fractions?
This clip explains that we work with decimal fractions because, "Â…our way of writing numbers depends on the number ten, so sticking with powers of 10 makes the arithmetic very easy."
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: 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.
Subtracting Fractions: Two Problems: Take-Away and Missing Addend
This clip explains that we subtract fractions in at least two kind of problems: take-away and missing addend. It then provides an example of each, along with instructions on how to solve them. In the take-away problem given, it's necessary to change...
Adding Fractions with Different Denominators: Finding Common Denominators and Multiples
This clip explains the role of multiples in finding common denominators. It also clarifies the difference between multiples and denominators, noting that "numbers have multiplesÂ…fractions have denominators".
Adding Fractions with Different Denominators: Finding the Least Common Multiple
This clip explains the use of prime factorization in finding the least common multiple.
Adding Fractions with Different Denominators: Least Common Multiple, The
This clip explains that using the least common multiple (which is another way of saying the smallest common multiple) as the common denominator is the simplest way to add fractions.
Adding Fractions with Different Denominators: Renaming Fractions
This clip introduces the concept of adding fractions with different denominators. It explains that this is done by re-naming the fractions so that they have the same denominator, which is accomplished by finding the common denominator.
Subtracting Fractions: Comparing Fractions With Different Denominators
This clip explains that comparing two fractions that don't have the same denominator requires multiplying the two denominators in order to find the common denominator of the fractions in question.