# Convert Your Systems! Going from metric to Household to apothecary in 20 easy steps!!

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Convert Your Systems! Going from metric to Household to apothecary in 20 easy steps!!

How many centimeters tall are you? How many grams do you weigh?

Household System O Most familiar in the United States O Units can be converted among themselves O Unknown measures can be determined using proportions or dimensional analysis BASE Units O Distance/length – inch, foot, yard, mile O Capacity/volume – drop, teaspoon, tablespoon, ounce, cup, pint, quart, gallonO Mass/weight – ounce, pound

Metric System O Used outside the United States.O More accurate O Based on units of 10 (easier to convert between units) BASE Units O Distance/length – meters O Capacity/volume – liters, ml O Mass/weight – grams

How many centimeters in 5 ft 5 in.? 165.1 cm How many kilograms in 135 lbs.? 297 kg

“You are to give a patient 1.5 oz. of Pepto Bismal. How many Tbls. should the patient take?“ Step 1: Look up the conversion for ounces to tablespoons. 1 oz. = 2 Tbls. Step 2: Set up the proportion 2 Tbls x 1.5 oz 1 oz. Step 3: Solve the problem by multiplying and dividing. 2 x 1.5 = 3 Tbls. The correct answer is 3 Tbls.

You need to take 450 mcg of aspirin and you have 0.3mg tablets. How many tablets should you take? 450mcg x 1mg 0.3mg 1000mcg 450 x 1 0.3 x 1000 450 300 1.5 tablets

A dose of 1.75g is ordered, but the drug comes in 500mg scored tablets. How many tablets should be given? 1.75 g x 1000 mg 500 mg 1 g 1.75 x 1000 500 mg 1750 mg 500 mg 3.5 tablets

How many Tbls. are in a 500 mL bottle of cough syrup? 500 mL x 1 Tbls x 1 tsp 1 bottle 3 tsp. 4.93 mL You know 3 tsp = 1 Tbls and 1 tsp. = 4.93mL so set it up… 500 x 1 x 1 = 500 1 x 3 x 4.93 14.79 33.81 Tbls per bottle

Hands on activity!

1. How many pounds in 150 kg? 2. How many milliliters in 5 teaspoons? 3. How many centimeters in 5 feet 7 inches? 4. How many ounces in 1.232 kilograms? 5. How many cc in 3.75 Tbls?