Question 14027
Romans added and subtracted their numerals to show the exact value that was needed.
     VI means 5+1 so
     VI means 6

IV means 5-1 so
IV means 4

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Now (IVXI) should be read from the left
(IV) means -4
(XI) means 11
so it means (11-4)=7
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(VIX) can be figured the same way
(V) means -5
(IX) means 9
so it means 9-5=4
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Hope this helps,
Prabhat