Question

Write the equivalent Hindu-Arabic
numerals for the given Roman numerals.
A. XXVIII B. XL
C. DCC
D. LXIII​

Answer 1

Answer:

A. XXVIII = 28

B. XL = 40

C. DCC = 700

D. LXIII = 63

Step-by-step explanation:

1. XXVIII = 28

Remember that X = 10, V = 5 and I = 1

As we have, X + X + V + I + I + I

                    = 2X + V + 3I

                    = (2 x 10) + 5 + ( 3 x 1 )

                    = 20 + 5 + 3 = 28

2. XL = 40

Note : When a roman numeral of smaller value is written before a roman numeral of greater value, The smaller value gets subtracted from the greater value.

Remember that, X = 10 and L = 50

As X ( 10 ) which is smaller than L ( 50 ) is added before L ( 50 ), X gets subtracted from L.

So , L - X

    = 50 - 10

    = 40

3. DCC = 700

D = 500 and C = 100

So, D + C + C

= 500 + 100 + 100

= 700

4. LXIII = 63

L = 50, X = 10, I = 3

So, L + X + I + I + I

= 50 + 10 + 1 + 1 + 1

= 60 + 3 = 63

Hope it helps..