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 Whole Numbers: Subtraction Problems May Not Be Rearranged
This clip explains that, while the addends can be rearranged or regrouped in addition without affecting the answer, the same is not true in subtraction.
Adding Signed Numbers: Adding More Than Two Signed Numbers
This clip explains that the best way to proceed when adding more than two signed numbers is to add all the positive addends and all the negative addends separately, then add the resulting sums.
Adding and Subtracting Decimal Fractions: Summary: Adding and Subtracting Decimal Fractions
This clip summarizes the main points of adding and subtracting decimal fractions. It revisits the idea that adding decimal fractions depends on lining up the addends by place value. The clip says that the easiest way to do this is by lining up the d...
Adding and Subtracting Decimal Fractions: Lining Up Numbers on the Decimal Point
This clip explains the importance of lining up the addends by place value when adding decimal fractions. It notes that every decimal fraction has a decimal point and, "
if we line up one column, all the rest line up automatically. Tens, units, tent...
Adding and Subtracting Decimal Fractions: Five Steps For Adding Decimal Fractions
This clip explains the five-step sequence that should be followed when decimal fractions are added: first, put in any missing decimal points; second, write the addends in the column lining up the decimal points; third, fill in the gaps on the right ...
Adding Signed Numbers: Summary: Adding Signed Numbers
This clip summarizes how to add signed numbers. It reviews two important rules, one pertaining to addition when the addends have the same sign, the other to addition when the addends have different signs. The clip also revisits the addition of 3 or ...
Addition of Whole Numbers, Part 2: Three Things to Remember About Addition of Whole Numbers
This clip reviews the key points about adding whole numbers. The first of these is that there are 100 addition facts that need to be memorized. The second is the idea of expanded notation. Third is the notion that, when we add, we can rearrange and ...