Understanding Decimal Fractions: Exponential Notation
This clip helps students better understand decimals and the power of 10 by using exponential notation to explain the relationship between the decimal point and the numbers that come before or after it.
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...
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: 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 ...
Multiplying Decimals: Summary: Multiplying Decimals
This clip summarizes multiplying decimals through a review of key points introduced in the lesson. These include the rule for multiplying two or more decimals, a shortcut for multiplying decimals by powers of 10, and an explanation that the basic ru...
Multiplying Decimals: Multiplying Decimals by Powers of Ten
This clip explains what it calls "a handy shortcut" that works when multiplying by powers of ten. "To multiply a decimal number by 10, move the decimal point one place to the right. To multiply by 100, move it two places to the right. To multiply by...
Multiplying Decimals: Rules for Multiplying Decimals
This clip explains the basic rules for multiplying decimals, stating that the first step is to multiply the numbers as if they were whole numbers, and then count up the number of digits to the right of the decimal point in both factors to determine ...