Practical Problem: Subtracting Boxes in a Warehouse
A practical problem solved using subtraction in an algebraic expression.
Subtracting Like Terms
Subtracting like terms demonstrated and applied to a practical problem.
Multiplying Signed Numbers: Multiplying Negative Numbers by Positive Numbers
This clip explains that, as when multiplying whole numbers, we can re-arrange the factors as much as we like when multiplying signed numbers. This enables us to solve multiplication problems in which the first factor is negative and the second posit...
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 Signed Numbers: Multiplying Two Numbers With Different Signs
This clip explains that, to multiply two numbers of different signs, in whatever order, "
first, multiply their absolute values, and then use the negative sign. We don't care which comes first, the positive number or the negative number."
Multiplying Signed Numbers: Multiplying Negative Numbers by Negative Numbers
This clip explains that when a negative number is multiplied by another negative number, the product is actually positive.
Multiplying Signed Numbers: Second Exercise in Multiplying Signed Numbers
In this clip, the student utilizes rules taught in the lesson's previous clips to solve problems involving multiplication of signed numbers.
Rules for Subtracting Algebraic Expressions
Rules for subtracting one algebraic expression from another and a step-by-step demonstration.
Dividing Signed Numbers: Summary: Dividing Signed Numbers
This clip summarizes the lesson on dividing signed numbers. The clip explains that the first step in dividing signed numbers is to divide their absolute values. "As for the sign of the answer," the clip continues, "
the rule we use in multiplying w...
Signed Fractions: Summary: Signed Fractions
This clip summarizes signed fractions. It explains that negative fractions are just as useful as any other kind of negative number. The clip then re-visits the question of what exactly constitutes a negative fraction. It states that, if the numerato...