Subtracting Fractions: Subtracting Fractions With the Same Denominator
This clip explains that subtracting fractions which have the same denominator simply requires that the smaller of the numerators be subtracted from the larger of the numerators, all over the denominator.
Subtracting Fractions: Summary: Subtracting Fractions
This clip summarizes subtracting fractions, explaining that the first step is to express the fractions with a common denominator. The clip also states that we can easily subtract mixed numbers by changing them to improper fractions.
Signed Fractions: Solving Equations Whose Solutions Are Negative Numbers or Fractions
This clip explains that, now that we understand signed numbers and fractions, we can solve equations whose solutions are not necessarily whole numbers. The clip states that, "
in general, it doesn't matter whether our equations involve positive or ...
Division and Subtraction and not Associative
Division and subtraction are not associative operations.
Does Order of Operations Matter?
Algebra includes addition, subtraction, multiplication and division which are called operations. In an algebraic expression, these operations are completed in a certain order. The order of these operations is discussed in this clip.
Division and Subtraction and not Commutative
Subtraction and division are not commutative.
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.
Examples of Algebraic Expressions: 'two times y' and 'two y plus 5'.
Two examples of algebraic expressions that demonstrate how a letter next to a number indicates multiplication; 2Y and 2Y 5.
Length: Practical Problem Involving Electrical Wire, A
This clip presents a practical problem involving the conversion of yards to meters. The student is asked to figure out how much electrical wire is left on a spool of 400 yards after an electrician uses 20 meters of wire for each of 16 apartments. "...
Other Examples using Parentheses in Mathematics
Using parentheses to clarify an expression. Evaluating expressions containing parentheses within parentheses.