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."
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: Summary: Dividing Decimal Fractions
This clip summarizes dividing decimal fractions, explaining that, "
in any division problem involving decimals, the first step is to make sure the quotient is a whole number." The clip explains how that is done, then notes that "
we place the deci...
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...
Changing Fractions to Decimals: Getting Used to Working With Fractions Converted to Decimals
This clip provides a problem in which the student is asked to change a fraction to its decimal form. The clip also notes that, "
it's a good idea to learn the decimal equivalents of the fractions we work with most often: one-half, one-third, and so...
Changing Fractions to Decimals: Changing Decimals to Fractions
This clip explains that if a decimal has 1 digit to the right of the decimal point, "
we can think of it as a fraction with the denominator of 10
.If a decimal has 2 digits to the right of the decimal point, we can think of it as a fraction with 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...
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: Adding Decimals to Solve a Distance Problem
This clip provides a distance problem which illustrates the fundamentals of adding decimal fractions. The clip suggests entering the decimal point of the answer before starting to add. It also suggests adding a zero to the right of the decimal point...
Adding and Subtracting Decimal Fractions: Subtracting Decimal Fractions
This clip explains that, as with adding decimal fractions, subtracting decimal fractions entails following a five-step process. The only difference, the clip points out, is that we subtract instead of add. The clip stresses that it's important to ma...