Solving Equations: Solving An Equation
This clip describes the steps in solving a simple equation. It states that "...the important thing is to study the equation, decide what you want to move around or get rid of, and proceed step by step." It also advises that "
it's usually easiest t...
Solving Equations: Using An Equation to Solve a Word Problem
This clip explains that, "
what makes equations tricky is that there's no set rule for doing them all. You have to size up each one separately, decide what needs doing, and get it done." The clip then goes through an equation step by step, beginnin...
Solving Equations: Equation Involving Subtraction, An
This clip demonstrates how to solve an equation involving subtraction, X-9=7, which eventually comes out to be X=7+9, or 16.
Signed Numbers: Introducing Negative Numbers
This clip uses the number line to illustrate that there can be negative numbers as well as positive numbers. Negative numbers on the number line are located to the left of the zero, rather than to the right.
Subtracting Signed Numbers: Summary: Subtracting Signed Numbers
This clip summarizes the lesson on subtracting signed numbers. It explains that "
in subtracting signed numbers, it would be most useful to think of subtraction as finding the missing addend." The clip also reviews the use of the number line in the...
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...
Subtracting Signed Numbers: Subtraction as Finding Missing Addends
This clip explains that subtraction can be looked at in either of two ways: having some quantity and taking away part of it, or finding the missing addend. "We have 4 dollars (and) we need 7. What must we add to 4 to get 7?" the clip asks. Because p...
Subtracting Signed Numbers: Subtracting Any Number is the Same as Adding Its Opposite
This clip explains that there's a way to subtract signed numbers that doesn't involve the number line. Through a series of examples, the clip demonstrates that subtracting any number is the same as adding that number with the opposite sign. "In othe...
Subtracting Signed Numbers: Shortcut in Subtracting Signed Numbers, A
This clip takes the student through a 3-step shortcut in subtracting signed numbers. Step 1 is to change the sign of the subtrahend from negative to positive or positive to negative. Step 2 is to change the subtraction to addition. Step 3 is to fini...
Subtracting Signed Numbers: Exercise in the Subtraction of a Negative Number, An
This clip provides an exercise in which the student must solve a subtraction problem involving a negative number. The clip includes the steps necessary to solve the problem, as well as the correct answer.