### Video instructions and help with filling out and completing Form 8815 Calculators

**Instructions and Help about Form 8815 Calculators**

This video is provided as supplementary material for courses taught at Howard Community College and in this video I want to do a couple of basic examples of calculating drug dosages so here's the first problem the order reads 600 milligrams the tablets contain 200 milligrams how many tablets should be given ok so we're going to start out with the order that's 600 milligrams that's going to be the beginning of the left side of an equation the right side of the equation is going to tell me how many tablets should be given so I'm going to leave a space for the number of tablets and I'll just write the unit which is tablets I know that each tablet contains 200 milligrams I'm going to take that information and make a fraction the fraction is going to be one tablet that's the numerator over how much each tablet contains 200 milligrams and since I'm dealing with fractions I might want to take the 600 milligrams and make that into a fraction I'll just put it over one you don't have to do that but if it makes it easier for you you can when I'm dealing with fractions I want to multiply all of the numerators multiply across and then multiply all the denominators but before that I want to see if I can simplify what I've got well I've got milligrams in both the numerators and the denominators so I'm going to cancel out the milligrams I've got 600 and 200 so I know I could divide both of these numbers by 100 so let's turn that 600 to a six by crossing off the two zeroes turn the 200 into a 2 by crossing out the two zeroes I've got a six and I've got it too I could simplify that I could divide both of those numbers by two so let's divide the six by two and I'll get three I'll divide the two by two and I get one and now my denominator has just a 1 and one in it so I'm not even going to have to worry about the denominator if I multiply the numerators across I get three times one tablet and that's going to mean I've got three tablets okay so basically what I did when I set this up was write on the right side on the left side I'm sorry on the left side the amount that was ordered that was the 600 milligrams on the left side of the equation I wrote the units that I was going to be dealing with tablets I took the remaining information the one tablet contains 200 milligrams made a fraction and then before multiplying I canceled out whatever I could then I multiplied across ended up with my answer here's another one the order is for a hundred and fifty milligrams scored tablets on hand contain 80 milligrams remember if the scored tablet it means if you need to you can cut it in half how many tablets should be given okay so the order was for 150 milligrams so I'll write 150 milligrams I'll put that over one since I'll be dealing with fractions on the right side of my equation I'll leave a space for the answer and the unit is going to be tablets so be some number of tablets and then my last bit of information is that one tablet or each tablet contains 80 milligrams so I'll make a fraction one tablet over 80 milligrams and now before multiplying I'll see what I can simplify I can simplify the units across out the milligrams in this fit in this numerator and this denominator I've got a hundred and fifty as a numerator and a denominator so I could divide both of those by 10 that would leave me with 15 and eight I can't simplify this anymore so multiplying across I'm going to get 15 15 tablets which I've already got the top it's written and that's going to be over what I get when I multiply the denominators which is just eight so we've got 15 over 8 tablets let's take that fraction we can put it into a calculator and that would tell us that that was equal to one point eight seven five tablets now at this point we have to think about whether we want to round this up or down or whether we have to cut the tablets in half so let's remember the rules for rounding when we're dealing with tablets that we can cut in half scored tablets so if the decimal part of our answer is between zero and point two four then we just round down if the decimal part of the answer is between 0.25 and point seven four then we would give a half a tablet we would have in other words one and a half tablets if the decimal part is between 0.75 and point nine nine then we would round up well the decimal part was point eight seven five so that would mean that we round this answer up and we're going to end up with two tablets okay so once again the basic approach was I write down the amount to ordered that starts at bits on the left side of the equation the right side is to note the units that I'm dealing with and then I take the number of milligrams that are in a tablet and I make a fraction cancel out whatever I can multiply across turn the answer into a decimal if it's not a simple answer and then decide what kind of rounding I have to do okay so that's about it take care I'll see you next time.