Dividing fractions is just about as easy; there's just one extra step. When you divide by a fraction, the first thing you do is flip-n-multiply. That is, you take the second fraction, flip it upside-down (find the reciprocal), and multiply the first fraction by this flipped fraction.1  Simplify. 2  Simplify.ultiplying fractions is easy: you multiply the top numbers and multiply the bottom numbers. For instance: When possible, you reduce. In the example above, however, nothing reduces, because 8 and 45 have no factors in common.
Sodium phosphate tablets are prescribed by the doctor doing the colonoscopy. There are two different brands, depending on which your doctor prescribes -- Visicol, a 40-tablet regimen, and Osmo-Prep, a 32-tablet regimen.
The physician performing the colonoscopy will give detailed instructions on how to follow the prep in the days leading up to the test. These instructions should be followed carefully. It is very easy to make a mistake, and below are listed several of the ways that people inadvertently ruin a colonoscopy prep. Don't do any of these things, ask questions if anything is unclear, and that colon will be ready for the scope!