Practice Math Calculations



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Practice Math Calculations

1. You need to administer a 3 mg dose of a medication, on hand is 4 mg/ml. How much do you need to draw up?

2. 375 mg of a liquid medication is ordered. You have available 125mg per 5ml, how much do you pour?

3. 25 mg of a medication is ordered IV; the vial is labeled 5 mg/2 ml. How many mls will you give?

4. An order reads for 0.1 mg of a medication to be given pre-op; available solution is 0.4 mg/2 ml. How much will you give?

5. The physician orders 1.25 mg of a medication daily for your patient. The only available tablet strength is 0.625 mg. What amount will you give?

6. Motrin 0.6g is ordered; available tablets contain 600 mg. How many tablets will you give?

7. 0.5 mg of a medication is ordered; available tablets contain 0.25 mg per tablet. How many tablets will you give?

8. Convert 7.5 grams to milligrams.

Converting Pounds to Kilograms


  1. 30 lb = _____________

  2. 15 lb 5 oz = _________

  3. 7 ¼ lb = ____________

  4. 22 lb = _____________

  5. 4 lb 5 oz = __________

  6. 75 lb = _____________

  7. 10 ½ lbs = __________


Pediatric Dosage Calculations
Problem 1

Child weighs 33 lbs

Physician order: Augmentin 150 mg po q 8 hours
Information from drug guide: children < 40 kg receive 6.7 to 13.3 mg/kg q 8 hours
Convert 33 lbs to kg ________
Calculate low and high dose _______ low dose _______ high dose
Is the dose in the safe range? ___________
The medication comes Augmentin 125 mg / 5 mL
How many mL would you need to draw up to equal 150 mg? _________
Problem 2

Child weighs 16 lb 10 oz

Physician order: Lasix 15 mg po bid
Information from drug guide:

The initial dose of Lasix (furosemide) for infants or children is 2 mg / kg / dose.

If initial dose works dosage may be increased to 1 or 2 mg / kg / dose (maintenance dose).

Doses greater than 6 mg / kg / day are not recommended.
Convert 16 lb 10 oz to kg ________
Calculate initial and high dose _______ initial dose _______ high dose
Is the dose in the safe range? ___________
The medication comes: Furosemide 10 mg/mL

How many mL would you need to draw up to equal 15 mg? _________

Answer Sheet:

1. 0.75 cc

2. 15 ml

3. 10 ml

4. 0. 5ml

5. 2 tabs

6. 1 tab

7. 2 tabs

8. 7500 mg

Converting

1. 13.63 kg 2. 15.31 lb = 6.95 kg 3. 7.25 lb = 3.29 kg 4. 10 kg

5. 4.31 lb = 1.95 kg 6. 34.09 kg 7. 4.77kg


Answer problem 1:

15 kg

Low dose 100.5 mg (6.7 x 15 kg)

High dose 199.5 mg (13.3 x 15 kg)

Safe range (100.5 mg to 199.5 mg) 150 mg is a safe dose.

You would give 6 mL Calculation 125 mg = 150 mg = 750 or X 5 =6ml

5 mL x mL 125 x



Answer Problem 2

16.62 pounds to 7.556 kg or 7.56 kg

Single dose of Lasix 7.56 kg x 2 mg = 15.12 mg/dose

High range daily dose 7.56 kg x 6 mg = 45.36 mg/dose

Is the dosage of 15 mg bid or 30 mg / day safe? = yes



How many mL? 1.5 mL

Calculation: 10 mg = 15 mg or X 1=1.5ml

1 mL x mL

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