If the pharmacy only carries 250 mg tablets of levofloxacin, how many tablets will you need to fill a single dose? Example 5 : A prescription calls for 2 grams of levofloxacin for one dose. NOTE: In pharmacy, it is imperative to include a leading zero before the decimal point to help reduce medication errors. Answer should be in kg, so divide both sides by 1000 g to remove gram units:Īnswer: This prescription requires 0.003 kg of ciprofloxacin.How many kilograms of ciprofloxacin are required to compound this prescription? Example 4 : A prescription calls for 3 grams of ciprofloxacin, but your scale measures in kilograms. Gram units cancel on each side, leaving:Īnswer: This prescription requires 3000 mg of amoxicillin.Answer should be in mg, so divide both sides by 0.001 g to remove gram units:.How many milligrams of amoxicillin are required to compound this prescription? Example 3: A prescription calls for 3 grams of amoxicillin, but your scale measures in milligrams. Teaspoon units cancel on each side, leaving:Īnswer: There are 50 mg of loratadine in 5 teaspoons of the solution.Answer should be in mg, so divide both sides by 1 tsp to remove tsp units:.Example 2: If 1 teaspoon of a solution contains 10mg of loratadine, how many milligrams are in 5 teaspoonfuls of that solution? Tablet units cancel on each side, leaving:Īnswer: There are 500 mg of sertraline in 5 tablets.Answer should be in mg, so divide both sides by 1 tablet to remove tablet units:.Using proportions, determine a ratio that is equal to :.Example 1: If 1 tablet contains 100 mg of sertraline, how many milligrams of sertraline are in 5 tablets? #Pharmacy technician math practice problems pdf how to#Examples 3, 4, and 5 explain how to convert units within the metric system using ratios and proportions. Examples 1 and 2 illustrate how to set up ratios and proportions. The following examples demonstrate how to use cross multiplication. Set the 2 products from steps 2 and 3 equal to each other.Multiply the numerator of the right-hand fraction by the denominator of the left-hand fraction.Multiply the numerator (top number) of the left-hand fraction by the denominator (bottom number) of the right-hand fraction.Express 2 ratios as fractions and set them equal to each other.The following explains the steps for cross-multiplication in further detail: Simply put, one should multiply diagonally across the equation. Using cross-multiplication reduces the proportion to a single equation to figure out the value of the variable. The variable is a placeholder for an unknown number. This is a method for solving an equation that involves a variable as part of 2 fractions set equal to each other. Using ratios and proportions often involves cross-multiplication. This can also be expressed as “100 mg per tablet”. To illustrate this concept, consider that 1 tablet contains 100 mg. As a result, people solve many calculations by setting up the problem as a ratio. Ratio and proportion calculations are based on the concept that one component is in proportion to another of equal value. Equivalent Values for Selected Units of Value 1
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