Multiplying Whole Numbers, Part 1: Arrays
This clip explains that one way to look at multiplication is through a pattern of columns and rows known as an array.
Multiplying Whole Numbers, Part 2: Multiplication Facts For 3
This clip explains that multiplying by 3 "
is like walking along the number line with steps three units long."
Multiplying Whole Numbers, Part 2: Multiplication Facts Table and Multiplication Facts for 1 and 0, The
This clip introduces a table as a means by which to learn multiplication facts. It also reviews multiplication of whole numbers by 1 and 0.
Multiplying Whole Numbers, Part 2: Multiplication Facts For 4 and 8
This clip suggests the use of arrays or the number line to learn the facts about multiplication by 4. It states that multiplication facts for 8 are essentially the same as those for 4 but doubled. The clip also reiterates the fact that multiplying a...
Multiplying Whole Numbers, Part 2: Multiplication Facts For 5 and 2
This clip explains that when two factors change places in a multiplication problem, the product remains the same. It then explains the multiplication facts for 5 and 2, noting that exercises can be completed with the help of a number line. The clip ...
Subtracting Whole Numbers: Using Columns to Subtract Two-Digit Numbers
This clip explains the use of columns when doing subtraction problems with "larger numbers." With this approach, we subtract "ones from ones, tens from tens (and), hundreds from hundreds."
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 ...
Addition of Whole Numbers, Part 2: Carrying
This clip explains what it means to carry when adding multi-digit whole numbers.
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 ...