Symbols used in rounding numbers questions

[Guest]

Hi,

I have a maths homework question in relation to rounding numbers, here is the question:

Which numbers round to 7,000,000 when rounding to the nearest 100,000?
6,962,DCC
7,039,815

My question is, what do the ‘DCC’ letters stand for?

Other homework questions also have the following symbols and I don’t know what these stand for, such as:
DCCLI
CDLIV
DXXV
DCCCXI
DXII
CI
MMMDCLXXIX
CMXCIX

Any help will be much appreciated. Thank you.

[shyamjayakannan]

They are the representation of numbers in the Roman Numeral System. I=1, V=5, X=10, L=50, C=100, etc.