# Math test help

1. I am trying to convert mg to ml. If I have Bicillin 1,200,000/2ml on hand and the doctor orders 900,00 units. I did 900,000 ÷1,200,000 =0.75 and then 0.75×2ml =1.5ml. Is this correct?
2. ### About cvinson30

Joined: Oct '17; Posts: 5

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3. Quote from cvinson30
I am trying to convert mg to ml. If I have Bicillin 1,200,000/2ml on hand and the doctor orders 900,00 units. I did 900,000 ÷1,200,000 =0.75 and then 0.75×2ml =1.5ml. Is this correct?
1.5 x 1,200,000 = 900,000

you are correct
4. You went about it a different way than I would have but your answer is correct.

I would have divided 1,200,000/2 mL to get 600,000 units/mL. (I am assuming the dose in the millions is in units, not mg, because I've never seen a million mg of anything as a dose.) Then I would divide 900,000 units by 600,000 units/mL to get 1.5 mL.
5. Hi,
If you do it like this you will never wonder if you did it correctly.

900,000 units (2 mL/1,200,000 units) = 1.5 mL

FYI, you should never have naked numbers running around without their units attached.

Brad Wojcik, PharmD
6. Quote from bjwojcik
FYI, you should never have naked numbers running around without their units attached.
This would eliminate a substantial percentage of errors.

Quote from cvinson30
I am trying to convert mg to ml
You really should strive to understand what the units represent in the physical sense. Mass (mg) plays no role in your problem.

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