Addition of Whole Numbers, Part I: Order of Addends
This clips explains that, when we add, we can arrange and group the addends in any order we like. The answer will always be the same.
Subtracting Fractions: Comparing Fractions With the Same Denominator
This clip explains that if two fractions have the same denominator, the number with the bigger numerator will be to the right of the other on the number line.
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.
Number Line, The: Summary: The Number Line
This clip summarizes the number line and how it can be used to show which of two whole numbers is greater, according to where each appears on a straight line. The clip revisits related concepts, including unit distance, graphs, coordinates, inequali...
Number Line, The: Introduction to the Number Line
This clip explains the concept of the number line, a kind of road map on which every whole number has a corresponding point. The points are in order, just like the numbers, and the distances between them are equal.
Number Line, The: Inequalities on the Number Line
This clip demonstrates how "less than" and "greater than" look on the number line. We learn that with any two whole numbers that are not equal, the greater number will always appear on the right, and the smaller number always appears on the left.
Adding Signed Numbers: Adding Numbers With Different Signs
This clip explains the rule for adding numbers with different signs. "Subtract the absolute value of the addends to get the absolute value of the answer," the clip advises. "As for the sign of the answer, it's the same as the sign of the addend with...
Adding Signed Numbers: Adding Negative Numbers
This clip explains the rule for adding two negative numbers: to get the absolute value of the answer, add the absolute values of the addends. "As for the sign of the answer," the clip continues, "
it's the same as the sign of the addends."
Adding Signed Numbers: Adding Positive Numbers
This clip explains the rule for adding positive numbers: to get the absolute value of the answer, add the absolute values of the addends. "As for the sign," the clip continues, "
it will be positive
same as the two addends."