Question

Bobby’s date of birth is ${{19}^{th}}$ September Express the data in Roman system.

Answer 1

Hint: Now we know that 10 is written as X and 9 is written as IX. Now 19 is 10 + 9. Hence we can write 19 in Roman accordingly.

Complete step by step answer:
Now let us understand how to write Roman numbers.
Now roman numbers can be written with Capital English letters.
Now for 1 we write it as letter I.
Now for 2 we write it as II.
Again for 3 we write as III.
Now for 5 we write as V.
Now consider 4.
We have 4 = 5 – 1.
Hence in Roman we write 5 – 1 as I before V. hence we write 4 as IV.
Now 6 = 5 + 1, for 5 + 1 = we write I after V. Hence we write as 6 as VI.
Now again 7 is written as VII, and for 8 we write it as VIII.
Now again we write 10 as X.
Now 9 = 10 – 1.
Hence in Roman we write 9 as IX.
Now again 11 in Roman is written as XI.
And thus we write Roman Numbers as.
Now similarly L is 50, 100 is C, D is 500.
Now let us see how to write 19.
Now 19 is 10 + 9.
Now first let us write 9 in Roman Number.
Now 9 = 10 – 1.
Hence we write 9 in Roman numbers as IX.
Now again we write 10 as X.
Hence 19 = 10 + 9 as XIX.
Hence 19 in Roman numbers can be written as XIX.

Hence 19 September is written as XIX September.

Note: Now note that when we write 10 – 1, we write as IX and not XI. We have to write I before X if we subtract 1 and after X if we add 1. This is something we use while writing any number, and hence if we add a number we write it after and if we subtract the number then we write it before.