Page 27 - Math Skill - 5

Roman Numerals 25

D. Assertion-Reason Based Questions
Directions for Questions 1 to 2: In each of the questions given below, there are two statements
marked as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.

(d) A is false but R is true.
Q. 1. Assertion (A) : The value of CM – CD + CVII is 607.
Reason (R) : Symbol V cannot be repeated and symbol C can be subtracted from D and
M only.
Q. 2. Assertion (A) : The value of CXXXVII is 137.
Reason (R) : Symbol X can be subtracted from L and C only.

Word Stock
Numerals System Repeat Maximum Symbol Expand

Activity

Objective : To learn the concept of addition in roman numeral system.
Material Required : Pencil, Earaser
Procedure : Harshil has found three codes that need to be converted into Roman numbers
before being converted into a 3-digit PIN number. Use the code breaker below to
help you to work out the PIN numbers.

Observation : I V X L C D M

1 5 10 50 100 500 1000

Code Roman numeral 3-digit PIN

Code 1 CDXXXV ____________

Code 2 CDXIII ____________

Code 3 CIV ____________

Assessment : Harshil has discovered that the correct PIN has a digit sum of 12. Which code
is the secret pin?
The secret pin code is: _______________