Dividing Fractions: Summary: Dividing Fractions
This clip summarizes dividing fractions, comparing it to the division of whole numbers, and examining the "invert and multiply" rule for dividing one fraction by another.
Subtracting Whole Numbers: Subtraction Problems May Not Be Rearranged
This clip explains that, while the addends can be rearranged or regrouped in addition without affecting the answer, the same is not true in subtraction.
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: 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...
Prime Numbers: Summary: Prime Numbers
This clip summarizes prime numbers, explaining the difference between prime and composite numbers, and demonstrating how to use the sieve of Eratosthenes to find prime numbers. The clip also explains prime factorization, stating that every whole num...
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.
Prime Numbers: Prime and Composite Numbers
This clip explains the difference between prime numbers and composite numbers. It also talks about how the Greeks figured out which numbers are primes and which are not.
Dividing Fractions: Reciprocals
This clip explains that the reciprocal is the fraction that results when the original fraction is inverted.
Adding Fractions With the Same Denominator: Adding Mixed Numbers
This clip explains how to add mixed numbers. One method is to add the whole numbers and the fractions separately and combine the results. Another approach is to convert the mixed numbers to improper fractions, then add as usual, and then change the ...
Adding Fractions With the Same Denominator: Adding Fractions With the Same Denominator
This clip explains how to add fractions with the same denominator. It states that the sum will be a fraction with the same denominator as the original one, and a numerator which consists of the original numerators added together.