Subtracting Whole Numbers: Borrowing
This clip uses expanded notation to demonstrate the technique known as borrowing in subtracting both two and three-digit numbers.
Changing Fractions to Decimals: Changing Fractions to Decimals
This clip explains that changing fractions to decimals is quite different from changing decimals to fractions. It takes us through the process of dividing the numerator by the denominator and asks the question: "How accurate do we want the answer? D...
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...
Rounding Numbers: Exercises: Rounding to the Nearest Tenth and Hundredth
This clip provides examples of how to round to the nearest tenth or hundredth. The clip explains that the procedure is basically the same in either case, except that, when rounding to the nearest tenth, it's necessary to look to the hundredths place...
Rounding Numbers: Rounding Numbers to the Nearest Unit
This clip talks about the use of rounding in measuring distances to the nearest whole number, rather than to the nearest tenth.
Rounding Numbers: Rounding Whole Numbers
This clip explains that decimals aren't the only numbers that can be rounded. "Whole numbers can also be rounded," the clip points out. Examples are then provided to show how that's done.
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 Practical Problems
This clip provides three real-world examples of how the ability to add whole numbers can be useful. The examples include calculating the following: the total number of miles driven during a multi-day trip, the total number of people who attended sev...
Multiplying Decimals: Exercises in Multiplying Decimals
This clip reviews the basic rules for multiplying decimals, then provides practice problems requiring the student to locate the decimal point. The clip also notes that, "
our rule for decimals is based on the rule for exponents."