Access full lesson containing this video at: http://www.yourteacher.com/algebra1/multiplyingfractions.php Students learn to multiply two fractions by multiplying across the numerators, and multiplying across the denominators. Students learn to divide two fractions by taking the reciprocal of the second fraction, then multiplying the fractions.
Duration : 0:1:31
Teach division of fractions step-by-step. First students learn sharing divisions with easy numbers (such as 1/2 : 4), thinking of sharing pie or pizza between so many people. Then students learn “measurement divisions” (such as 3 : 1/2), thinking “how many times does the divisor fit into the dividend”. Both of these kinds of division problems are meant to be solved mentally, concentrating on the concepts. In part 2, I show how to teach reciprocal numbers and the general shortcut for fraction division.
Duration : 0:6:24
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dividingfractions.php Students learn to divide fractions by first changing the division sign to multiplication and flipping the second fraction. For example, to simplify 7/12 divided by 7/9, first change the division sign to multiplication and flip the second fraction, to get 7/12 x 9/7. Next, multiply the fractions by first cross-canceling, then multiplying across the numerators and across the denominators.
Duration : 0:1:15
Access full lesson containing this video at: http://www.yourteacher.com/prealgebra/dividingdecimals.php Students learn to divide a decimal by a decimal by first multiplying both decimals by the power of 10 that changes the second decimal to a whole number. For example, to divide 0.16 by 0.8, first multiply both decimals by 10, to get 1.6 8. Next, divide the decimal by the whole number in the same way that one would divide a whole number by a whole number (using long division). However, at the end of the problem, the decimal point is brought straight up from the decimal that is inside the division symbol to the answer that is written on top of the division symbol.
Duration : 0:1:42
Dividing decimal numbers
Dividing fractions