Understanding Decimal Fractions: Why Use Decimal Fractions?
This clip explains that we work with decimal fractions because, "
our way of writing numbers depends on the number ten, so sticking with powers of 10 makes the arithmetic very easy."
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.
Understanding Decimal Fractions: Reading Decimal Fractions: Using Words
This clip explains how to read and say decimals using words. It makes the point that the word "and" is only used to indicate the position of the decimal point.
The Meaning of Percentage: Summary: The Meaning of Percentage
This clip summarizes the key points about percentage, stressing at the outset that it's practical to be able to view all fractions with the same denominator. The clip then talks about the different ways we can express the same value in decimal, frac...
Rounding Numbers: Summary Example and an Exercise
This clip walks us through two examples of rounding with decimal numbers, then invites the student to, "
try one yourself...(and) handle it like the problem we just finished." The clip then talks about the importance of, "
returning to the origina...
Rounding Numbers: Rounding to the Nearest Tenth
This clip explains the procedure used in rounding to the nearest tenth. "The place to look is the hundredths place," the clip explains. "If it's less than five, leave the tenths place unchanged and drop everything to the right. If it's five or more,...
Rounding Numbers: What Are Rounded Numbers?
This clip explains what rounded numbers are and how they are commonly used. The clip states that, "
when we talk of rounded numbers, we mean they're not exact."
Length: Converting Between the U.S. Customary and Metric Systems
This clip explains how to use both the unit cancellation and decimal methods to convert between the U.S. Customary and Metric Systems. "To convert between the two systems," the clip states, "we'll use a new equivalence: 1 inch equals 2.54 centimeter...
Compound Denominate Numbers: Working With Metric Compound Denominate Numbers
This clip explains how working with metric compound denominate numbers differs from compound denominate numbers in the U.S. Customary System. "In the Metric System, we don't usually see a value like 21 meters 72 centimeters," the clip states. "Inste...
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...