Calculations - Understanding Number
Systems and Operations Exam ACTUAL
QUESTIONS AND CORRECT ANSWERS
What two types of number systems are used in pharmacy calculations? - CORRECT
ANSWER Arabic numbers and Roman numerals
The ___ number system uses numbers, fractions, and decimals. - CORRECT
ANSWER Arabic (definition)
the ___ system uses letters to represent quantities or amounts. - CORRECT
ANSWER Roman numeral (definition)
Which of the two number systems (Arabic numbers and Roman numerals) is more commonly
used in the healthcare setting? - CORRECT ANSWER Arabic numbers
The Arabic number system has its roots in India and consists of 10 digits: 0, 1, 2, 3, 4, 5, 6, 7,
8, and 9. When these digits are combined, they represent every possible number. In
expressions using Arabic numbers, whole numbers are to the ___ of a decimal point, whereas
fractions are to the ___ of a decimal point. - CORRECT ANSWER left, right
The Roman numeral system can be traced back to ancient Rome and includes seven main
symbols: I (equal to ___), V (equal to ___), X (equal to ___), L (equal to ___), C (equal to
___), D (equal to ___), and M (equal to ___). Being able to interpret Roman numerals when
used on prescriptions and medication orders is important for the accurate preparation and
dispensing of medications - CORRECT ANSWER (i/I) 1
(V) 5
(X) 10
(L) 50
(C) 100
,(D) 500
(M) 1000
When a numeral is repeated or a smaller numeral follows a larger one, the numerals are ___ -
CORRECT ANSWER added
iii = ? - CORRECT ANSWER 3
VII = ? - CORRECT ANSWER 5+1+1=7
XXI = ? - CORRECT ANSWER 10 + 10 + 1 = 21
LVII = ? - CORRECT ANSWER 50 + 5 + 1 + 1 = 57
LXV = ? - CORRECT ANSWER 50 + 10 + 5 = 65
CXIII = ? - CORRECT ANSWER 100 + 10 + 1 + 1 + 1 = 113
When a smaller numeral comes before a larger numeral, the smaller numeral is . . . -
CORRECT ANSWER subtracted from the larger numeral.
IV = ? - CORRECT ANSWER 5−1=4
IX = ? - CORRECT ANSWER 10 − 1 = 9
CD = ? - CORRECT ANSWER 500 − 100 = 400
Numerals are never repeated more than ___ times in sequence. - CORRECT
ANSWER three
, III = ? - CORRECT ANSWER 3
XXX = ? - CORRECT ANSWER 30
XL = ? - CORRECT ANSWER 40
When a smaller numeral comes between two larger numerals, the smaller numeral is . . . -
CORRECT ANSWER is subtracted from the numeral that follows.
XIX = 10 + (10 − 1) = 19
XIV = ? - CORRECT ANSWER 10 + (5 − 1) = 14
A prescription is received in the pharmacy and includes the following notation: Disp: C
tablets. How many tablets are to be dispensed? - CORRECT ANSWER The quantity of
tablets to dispense is 100 tablets, indicated by the Roman numeral C.
The following prescription is received in the pharmacy. How many tablets are in the ordered
dose, and how many tablets are to be dispensed?
Diphenhydramine XXV mg
Dosing instructions: Take tablets by mouth each night.
Quantity to dispense: XXXII tablets - CORRECT ANSWER For this prescription,
there are 2 tablets of diphenhydramine in the ordered dose, and 32 tablets must be dispensed
DCXXIV = ? - CORRECT ANSWER 624
XLVIII = ? - CORRECT ANSWER 48
67 as a roman numeral - CORRECT ANSWER LXVII