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.
Understanding Decimal Fractions: Summary: Understanding Decimal Fractions
This clip summarizes the "Understanding Decimal Fractions" lesson, including use of the decimal point "to signal the units place of a number and then continue with digits to the right of the decimal point, signifying tenths, hundreds and so on." The...
Understanding Decimal Fractions: Zeros to the Right of the Decimal
This clip explains that adding extra zeros following a number or numbers to the right of a decimal point does not change the value of the decimal.
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 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...
Signed Numbers: Number Line Exercises
This clip offers practice in locating a set of numbers known as "the set of integers" on the number line. The clip explains that the integers include zero, but don't include any fractions, positive or negative.
Dividing Decimal Fractions: Changing the Decimal Divisor to a Whole Number
This clip states that "mathematicians never divide by decimals. If the divisor is a decimal, they change it to a whole number." The clip then explains how this is done, with the divisor multiplied by some power of ten to become a whole number and th...
Dividing Decimal Fractions: Placing the Decimal Point in the Quotient
This clip reviews the concept of changing divisors that are decimals into whole numbers. The clip then poses the following question: "(Once that's done) where do we put the decimal point of the answer, the quotient?" The clip then explains that "
t...
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...