Med Math Practice
1 gr = X mg - ANS-1 gr = 60 mg
\1 gram = X mg - ANS-1 gram = 1000 mg
\1 kg = X lbs - ANS-1 kg = 2.2 lbs
\1 mcg = X mg - ANS-1 mcg = 0.001 mg
\1 mg = X gm - ANS-1 mg - 0.001 gm
\1 mg = X mcg - ANS-1 mg = 1000 mcg
\1 ounce = X grams - ANS-1 ounce = 28.3495231 grams
\1 ounce = X mL - ANS-1 ounce = 30 mL
\1 tsp = X mL - ANS-1 tsp = 5 mL
\1000 mL solultion is ordered to infuse over 8 hours. How many mL/hr should the IV flow rate? -
ANS-Set up calculation as 1000 mL/ 8 hr= X mL/1 hr and cross multiply 8hr * X mL = 1000 mL x
1 hr ; solve for x = X mL = 1000 mL x 1 hr/8 hrs = 125 mL/hr
\8 mg is ordered. It is available as 10 mg/mL. How many mL should be administered? -
ANS-Answer 0.8 mL
calculate by dividing the dose ordered/available concentration in 1 mL
8 mg/10mg/mL = 8/10mL = 0.8mL
\8 ounces = X mL - ANS-8 ounces = 240 mL
\Calculate the IV Drip Rate when 1000 mL of D5W ordered to be administered over 8 hours.
The IV tubing drip factor is 10 gtts/mL. - ANS-First convert hrs to mins 8 hrs = 480 minutes
volume to be infused = 1000 mL
Drip factor = 10 gtts/mL
(1000 mL x 10 gtts/mL)/480 min =
10000 gtts/ 480 min = 20.83 gtts/min
rounded to the nearest whole number = 21 gtts/min
\Convert 2 gm to mg - ANS-2 gm x 1000 = 2000 mg
\Convert 2500 mcg to mg - ANS-2500 mcg ÷ 1000 = 2.5 g
\Convert 300 mg to gm - ANS-300 gm ÷ 1000 = 0.3 gm
\Convert 4 mg to mcg - ANS-4 mg x 1000 = 4000 mcg
\Convert 99 lb to kg - ANS-99 lbs ÷ 2.2 = 45 kg
\Convert grain (gr) to milligram (mg) - ANS-To convert grains (gr) to milligrams (mg) multiply by
60
To convert mg to grains (gr) divide grains by 60
1 gr = 60 mg
\Convert grams (g) to milligrams (mg) - ANS-To convert grams (gm) to milligrams (mg),
move decimal point 3 places to right 1.0 1000.0 or multiply grams (gm) by 1000
\Convert killigram (kg) to pounds (lbs) - ANS-To convert kilograms (kg) to pounds (lb),
multiply kg by 2.2
To convert pounds (lb) to kilograms (kg),
divide lb by 2.2
, \Convert microgram (mcg) to milligram (mg) - ANS-To convert micrograms (mcg) to milligrams
(mg), move decimal point 3 places to the left 1.0 0.001 or divide micrograms (mcg) by 1000
\Convert milligram (mg) to gram (gm) - ANS-To convert milligrams (mg) to grams (gm),
move decimal point 3 places to the left 1.0 0.001 or divide milligrams (mg) by 1000
\Convert milligram (mg) to microgram (mcg) - ANS-To convert milligrams (mg) to micrograms
(mcg), move decimal point 3 places to right 1.0 1000.0 or multiply milligrams (mg) by 1000
\Convert tsp to mL - ANS-To convert teaspoon (tsp) to milliliters (mL),
multiply tsp by 5 = 1 tsp = 5 mL
\Doctor has ordered 500 mg and capsules come in 250 mg per capsule - how many capsules
are needed? - ANS-set up the problem as
250mg/1 capsule = 500 mg/x capsules
cross multiple 250mgX = 500mg and solve for x by dividing 500/250 = X x =2
2 capsules required for 500 mg
\How to calculate IV drip rate? - ANS-IV Drip Rate (gtts/min) = (Volume to be infused (mL) X
Drip Factor of tubing gtts/mL)/time (in min) to be infused
\Ordered 20,000 units in 1000 mL to run at 30 mL/hour.
How many units per hour is the patient receiving? - ANS-20,000 units/1000 mL = X units/30 mL
1000 mL x X units = 20,000 units x 30 mL
X units = 20,000 units x 30 mL/1000 mL
X units = 600,000 units/ 1000 = 600 units/hr
\Ordered: 0.03 gm
Available: 6 mg/8 mL
How many mL should the nurse give? - ANS-0.03 gm x 1000 = 30 mg
(6mg/8mL) = (30 mg/X mL)
6 mg x X mL = 8 mL x 30 mg
6 mg = 8 mL x 30 mg/6 mg = 40 mL
\Ordered: 0.125 mg
Available: 0.25 mg/tablet
How many tablet(s) should the nurse give? - ANS-(0.25mg/1 tablet)=(0.125mg/X tablets)
0.25 mg * X tablets = 1 tablet * 0.125mg
X tablets = (1 tablet * 0.125 mg)/0.25 mg = 0.5 tablets
\Ordered: 0.3 gm
Available: 300 mg/tablet
How many tablet(s) should the nurse give? - ANS-0.3 gm x 1000 = 300 mg
(300 mg/1 tablet) = (300 mg/ X tablet)
300 mg x X tablet(s) = 1 tablet x 300 mg
X tablet(s) = (1 tablet x 300 mg)/300 mg = 1 tablet
\Ordered: 0.5 mg
Available: 2 mg/mL
How many mL should the nurse give? - ANS-2mg/1mL = 0.5 mg/X mL
2 mg x X mL = 1 mL x 0.5 mg
X mL = (1mL* 0.5 mg)/2 mg = 0.25 mL
\Ordered: 0.6 mg
Available: 250 mcg/mL
1 gr = X mg - ANS-1 gr = 60 mg
\1 gram = X mg - ANS-1 gram = 1000 mg
\1 kg = X lbs - ANS-1 kg = 2.2 lbs
\1 mcg = X mg - ANS-1 mcg = 0.001 mg
\1 mg = X gm - ANS-1 mg - 0.001 gm
\1 mg = X mcg - ANS-1 mg = 1000 mcg
\1 ounce = X grams - ANS-1 ounce = 28.3495231 grams
\1 ounce = X mL - ANS-1 ounce = 30 mL
\1 tsp = X mL - ANS-1 tsp = 5 mL
\1000 mL solultion is ordered to infuse over 8 hours. How many mL/hr should the IV flow rate? -
ANS-Set up calculation as 1000 mL/ 8 hr= X mL/1 hr and cross multiply 8hr * X mL = 1000 mL x
1 hr ; solve for x = X mL = 1000 mL x 1 hr/8 hrs = 125 mL/hr
\8 mg is ordered. It is available as 10 mg/mL. How many mL should be administered? -
ANS-Answer 0.8 mL
calculate by dividing the dose ordered/available concentration in 1 mL
8 mg/10mg/mL = 8/10mL = 0.8mL
\8 ounces = X mL - ANS-8 ounces = 240 mL
\Calculate the IV Drip Rate when 1000 mL of D5W ordered to be administered over 8 hours.
The IV tubing drip factor is 10 gtts/mL. - ANS-First convert hrs to mins 8 hrs = 480 minutes
volume to be infused = 1000 mL
Drip factor = 10 gtts/mL
(1000 mL x 10 gtts/mL)/480 min =
10000 gtts/ 480 min = 20.83 gtts/min
rounded to the nearest whole number = 21 gtts/min
\Convert 2 gm to mg - ANS-2 gm x 1000 = 2000 mg
\Convert 2500 mcg to mg - ANS-2500 mcg ÷ 1000 = 2.5 g
\Convert 300 mg to gm - ANS-300 gm ÷ 1000 = 0.3 gm
\Convert 4 mg to mcg - ANS-4 mg x 1000 = 4000 mcg
\Convert 99 lb to kg - ANS-99 lbs ÷ 2.2 = 45 kg
\Convert grain (gr) to milligram (mg) - ANS-To convert grains (gr) to milligrams (mg) multiply by
60
To convert mg to grains (gr) divide grains by 60
1 gr = 60 mg
\Convert grams (g) to milligrams (mg) - ANS-To convert grams (gm) to milligrams (mg),
move decimal point 3 places to right 1.0 1000.0 or multiply grams (gm) by 1000
\Convert killigram (kg) to pounds (lbs) - ANS-To convert kilograms (kg) to pounds (lb),
multiply kg by 2.2
To convert pounds (lb) to kilograms (kg),
divide lb by 2.2
, \Convert microgram (mcg) to milligram (mg) - ANS-To convert micrograms (mcg) to milligrams
(mg), move decimal point 3 places to the left 1.0 0.001 or divide micrograms (mcg) by 1000
\Convert milligram (mg) to gram (gm) - ANS-To convert milligrams (mg) to grams (gm),
move decimal point 3 places to the left 1.0 0.001 or divide milligrams (mg) by 1000
\Convert milligram (mg) to microgram (mcg) - ANS-To convert milligrams (mg) to micrograms
(mcg), move decimal point 3 places to right 1.0 1000.0 or multiply milligrams (mg) by 1000
\Convert tsp to mL - ANS-To convert teaspoon (tsp) to milliliters (mL),
multiply tsp by 5 = 1 tsp = 5 mL
\Doctor has ordered 500 mg and capsules come in 250 mg per capsule - how many capsules
are needed? - ANS-set up the problem as
250mg/1 capsule = 500 mg/x capsules
cross multiple 250mgX = 500mg and solve for x by dividing 500/250 = X x =2
2 capsules required for 500 mg
\How to calculate IV drip rate? - ANS-IV Drip Rate (gtts/min) = (Volume to be infused (mL) X
Drip Factor of tubing gtts/mL)/time (in min) to be infused
\Ordered 20,000 units in 1000 mL to run at 30 mL/hour.
How many units per hour is the patient receiving? - ANS-20,000 units/1000 mL = X units/30 mL
1000 mL x X units = 20,000 units x 30 mL
X units = 20,000 units x 30 mL/1000 mL
X units = 600,000 units/ 1000 = 600 units/hr
\Ordered: 0.03 gm
Available: 6 mg/8 mL
How many mL should the nurse give? - ANS-0.03 gm x 1000 = 30 mg
(6mg/8mL) = (30 mg/X mL)
6 mg x X mL = 8 mL x 30 mg
6 mg = 8 mL x 30 mg/6 mg = 40 mL
\Ordered: 0.125 mg
Available: 0.25 mg/tablet
How many tablet(s) should the nurse give? - ANS-(0.25mg/1 tablet)=(0.125mg/X tablets)
0.25 mg * X tablets = 1 tablet * 0.125mg
X tablets = (1 tablet * 0.125 mg)/0.25 mg = 0.5 tablets
\Ordered: 0.3 gm
Available: 300 mg/tablet
How many tablet(s) should the nurse give? - ANS-0.3 gm x 1000 = 300 mg
(300 mg/1 tablet) = (300 mg/ X tablet)
300 mg x X tablet(s) = 1 tablet x 300 mg
X tablet(s) = (1 tablet x 300 mg)/300 mg = 1 tablet
\Ordered: 0.5 mg
Available: 2 mg/mL
How many mL should the nurse give? - ANS-2mg/1mL = 0.5 mg/X mL
2 mg x X mL = 1 mL x 0.5 mg
X mL = (1mL* 0.5 mg)/2 mg = 0.25 mL
\Ordered: 0.6 mg
Available: 250 mcg/mL
