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Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

The number of matchsticks that can be used to write 23 in Roman system are

  1. 6

  2. 7

  3. 8

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Roman numerals are represented by the following letters:

I = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000

If a numeral is followed by another numeral of lower denomination, the two are added together;

if it is preceded by one of lower denomination, the smaller numeral is subtracted from the greater.

 

23 = XXIII
Therefore, Number of matchsticks required is 7.
Multiple choice roman numbers and numbers upto hundred roman numerals knowing our numbers maths

Which of the following statements is/are INCORRECT?
(i) Eighty four in Roman numeral is written as $CXXXIV$
(i) There are seven zeroes in $1$ crore.
(iii) There are ten thousand milligrams in $1kg$
(iv) The smallest $4$-digit number formed by using all the digits $4,3,0,8$ without repetition is $3048$

  1. Both (i) and (iii)

  2. Both (i) and (iv)

  3. Only (i)

  4. Only (ii)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
(i) $84=LXXXIV$
(ii) $1\quad crore=10000000$
(iii) $1kg=1000g=1000\times 10000mg=10000000mg$
(iv) Smallest number formed is $3048$
(i) and (iii) are INCORRECT
Answer : A