Dosage Calculations Packet-word

# Dosage Calculations Packet-word - 1 LINCOLN MEMORIAL...

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1 LINCOLN MEMORIAL UNIVERSITY Caylor School of Nursing Dosage Calculation Packet 2009-2010 Mrs. Tammy Dean, MSN, RN ASN Program Chair Associate Professor of Nursing Rev 05/31/09

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2 Unit I – Basic Mathematics Review This unit will review fractions, decimals, percentage, and ratio and proportion. FRACTIONS Definition: A fraction is a part of a whole number. A fraction has 2 parts, the top number is called the numerator and the bottom number is called the denominator. Example: ½ = 1 is the numerator and 2 is the denominator. There are 4 types of fractions: 1. Proper fractions – the numerator is less than the denominator. Example: ½. 2. Improper fractions – the numerator is greater than the denominator. Example: 6/5. 3. Complex fractions – the numerator or denominator may be either a fraction or a whole number. Example: ½ or ½ 2 ¾ 4. Mixed number – there is a whole number and a fraction combined. Example: 3 ½. To change a mixed number to an improper fraction, you must multiply the whole number by the denominator and add the numerator. Example: 3 ½ = 7/2. Practice Problems # 1 Reduce the following fractions to the lowest terms. The answers are on pages 29-31 of the dosage calculation packet. 1. 2/4=_____ 2. 2/8=_____ 3. 15/20= _____ 4. 3/9=_____ Change the following improper fractions to mixed numbers 1. 6/4=_____ 2. 7/5=_____ 3. 15/8= _____ 4. 3/2=_____ Change the following mixed numbers to improper fractions 1. 3 ½=_____ 2. 6 ½=_____ 3. 10 ½=_____ 4. 33 1/3= _____ Rev 05/31/09
3 Multiplying Fractions: 1. Multiply the numerators. 2. Multiply the denominators. 3. Reduce to the lowest terms. Example: 3 x 2 = 6 Reduced = 1 4 3 12 2 Dividing Fractions: 1. Invert the divisor (2/3 would become 3/2). 2. Change the division sign to multiplication. 3. Multiply the numerators. 4. Multiply the denominators. 5. Reduce to the lowest terms. Example: 1 divided by 1 = 1 x 2 = 2 3 2 3 1 3 This answer is reduced to the lowest terms. Practice Problems # 2 Multiply or divide the fractions. The answers are on pages 29-31of the dosage calculation packet. 1. 2/3 x 1/8=_____ 2. 9/25 x 4/32=_____ 3. 1/9 ÷ 3/9=_____ 4. 1/5 ÷ 1/2= ___ DECIMALS: Dividing Decimals: 1. Change the dividing number to a whole number by moving the decimal point to the right. 2. Change the number being divided by moving its decimal point the same number of places to the right. 3. Divide as usual. 4. Place the decimal point in the answer directly above the decimal point in the dividend. 5. Carry out the answer to 3 decimal places before rounding off to 2 places. Example: 73. 0.03 ) 2.19 The answer is 73. 2 1 09 9 0 Rev 05/31/09

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4 Practice Problems # 3 Divide the decimals. The answers are on pages 29-31 of the dosage calculation packet 1. 0.75 ÷ 0.5=_____ 2. 0.2 ÷ 0.02=_____ 3. 140 ÷ 6=_____ 4. 140 ÷ 7.8= ___ Rounding Decimals: 1. Determine at what place you are going to round. 2. If the number to the right of the place you are going to round is greater than or equal to 5, round up to the next number.
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## This note was uploaded on 04/21/2010 for the course MATH 120 taught by Professor Aymen during the Spring '10 term at Albany Medical College.

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Dosage Calculations Packet-word - 1 LINCOLN MEMORIAL...

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