Can someone please expalin this math problem to me please?

I am struggling with this conversion and then I get a really tough question such as this,
here is the problem:
You are to administer Trazadone 450 mg po. The available unscored tablets are 200,100,50, and 25 mg. How many tablets and of which strength should you administer?
another question can someone please explain all about conversion?Sadly I don't have a clue about how to do this sort of thing
Thank you for all your kindness in helping me out 

Sep 23, '07Joined: May '06; Posts: 528; Likes: 34Hmm, I have never had a question like that but I would give 2, 200's and 1, 50.

Sep 23, '07Joined: Nov '05; Posts: 65; Likes: 20Your freeking out, calm down. Think of it as apples. you need 400 apples, there are boxes of 200, 100, 50, and 25.
so you need 2 boxes of 200 and one box of 50
does that help
and by the way thats a lot of trazadone! 
Sep 23, '07Joined: Jan '07; Posts: 4,317; Likes: 4,901You always want to try and give the least amount of pills as possible.
so you'd go for 2 200mg and 1 50mg..NOT 4 100's and 1 50mg etc
As for conversions first you have to know bigger to smaller for example:
k, g, mg, mcg. Then you take what you are converting from..say you need to convert from grams to milligrams. Think of it like this: you are going from Larger to smaller..see that "L" in larger..its pointing you in the direction to move the decimal point. You move it 3 points for each size you are going. So with 25g you are going Larger to smaller and only one set of 3. So 25g=25000mg. If you were going g to mcg..you would move the decimal 2 sets of 3 so it would be 25g = 25000000mcg
Now say you need to convert 7500mg to grams..you are going a Smaller size to a larger..now look at that S..the S is pointing you in the direction to move the decimal point..to the left.
so its 7.5g
I hope that makes sense. I wish I could actually show you. But I always put my L and S at the top of the page. And I put my measurements L,ml, mcl and k,g,mg,mcg etc next to it 
Sep 23, '07Specialty: med/surg, telemetry, IV therapy, mgmt ; Joined: May '05; Posts: 15,027; Likes: 8,983You are to administer Trazadone 450 mg po. The available unscored tablets are 200,100,50, and 25 mg. How many tablets and of which strength should you administer?
The way to mathematically work this problem would be to divide 450 by the different strengths of tablets you have available.
450 divided 200 = 2.5There are multiple answers to this problem that would make it correct
450 divided 100 = 4.5
450 divided 50 = 9
450 divided 25 = 18
Two 200 mg tablets + one 50 mg tabletConversion is the change from one unit of measure to another.
Two 200 mg tablets + two 25 mg tablets
Four 100 mg tablets + one 50 mg tablet
Four 100 mg tablets + two 25 mg tablets
Nine 50 mg tablets
Eighteen 25 mg tablets 
Sep 23, '07Occupation: Medical Imaging RN~Special Procedures CT Specialty: 33 year(s) of experience in OB, M/S, HH, Medical Imaging RN ; Joined: Aug '04; Posts: 6,708; Likes: 1,450You know, for this kind of a problem I would make a picture. Make four squares and label them "200", "100", "50", and "25". Think about what combinations of these you would use to come up with a total of 450. You are allowed to use multiples of the different squares.
The way to mathematically work this problem would be to divide 450 by the different strengths of tablets you have available.450 divided 200 = 2.5450 divided 100 = 4.5450 divided 50 = 9450 divided 25 = 18
There are multiple answers to this problem that would make it correctTwo 200 mg tablets + one 50 mg tabletTwo 200 mg tablets + two 25 mg tabletsFour 100 mg tablets + one 50 mg tabletFour 100 mg tablets + two 25 mg tabletsNine 50 mg tabletsEighteen 25 mg tablets
Simply you need 450 mg, The tablets are unscored so you cannot break them in half. You need to use as few as pills as possible. There is only one correct answer.
2  200 mg tablets, plus 1  50 mg tablet = 450 mg.Last edit by DutchgirlRN on Sep 23, '07