Multiplying Signed Numbers: Multiplying Positive Numbers by Negative Numbers
This clip explains that, to multiply a positive number and a negative number, "
multiply their absolute values and use the negative sign."
Multiplying Two Factors with the Same Base
The rules for exponents begin with the rule for multiplying two factors with the same base.
Signed Fractions: Adding Signed Fractions
This clip explains that the rules for working with signed fractions are exactly the same as for any other signed numbers. "Wherever you find the negative sign," the clips states, "
move it out in front of the entire fraction, then treat the fractio...
Addition of Whole Numbers, Part I: Addition Tricks and Hints
This clip presents a variety of hints and tricks that make learning the 100 addition facts simple and automatic. Among these are the identity for addition, and re-grouping addends in the easiest possible order.
Multiplying Signed Numbers: Other Ways of Indicating Multiplication by Signed Numbers
This clip explains that signs can sometimes be confused with orders to add or subtract. To avoid this, signed numbers are sometimes enclosed in parentheses. And, in some instances, if both factors are in parentheses, "
we sometimes leave out the mu...
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...