Mathletics - Roman Numerals to 1000

Hi, this is my post about Mathletics and it is about comparing while trying to add & subtract.
I've been learning to compare roman numerals. This is the key I = 1, V = 5 X = 10 L = 50 C = 100 D = 500 M = 1000. Putting numbers before a bigger number takes it away by the number before it eg. XIX = 19
Here is the screenshot.

I got a tick for getting it right if you look at the top it is Number Knowledge and Place Value - Converting to Roman Numerals to 1000.

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