Signed Numbers: Comparing Signed Numbers
This clip explains that one number is smaller than the second if the first is to the left of the second on the number line. This is true with signed numbers as well.
Multiplying Signed Numbers: Summary: Multiplying Signed Numbers
This clip reviews the basic rules that apply to multiplying signed numbers. If the two signs are the same, the answer is positive. If they're different, the answer is negative. And, when multiplying more than two signed numbers, if there's an even n...
Signed Numbers: Summary: Signed Numbers
This clip summarizes the use of both negative and positive numbers, as well as their location on the number line. "All these numbers," the clip states, "Â…are called 'signed numbers'." The clip also reviews how to determine which of two signed numbe...
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.
Signed Fractions: Dividing Signed Fractions
This clip explains that, when dividing signed fractions, the basic approach is the same as any operation with signed fractions. Once we figure out what's being divided into what, we divide the absolute values. And, in this instance, because the prob...
Signed Numbers: Positive Numbers
This clip explains that the symbol for positive numbers is the plus sign. If a number has no sign at all, it's understood to be positive. On the number line, the positive numbers are lined up in order to the right of the zero, in what is called "the...
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: Subtracting a Negative Number From a Positive Number
This clip explains the steps necessary to solve a problem in which a negative number is subtracted from a positive number.
Subtracting Signed Numbers: Subtracting a Larger Number From a Smaller Number
This clip explains the steps necessary to solve a problem in which a larger number is subtracted from a smaller number.