Go out and get yourself 15 matchsticks. You’re going to use the matchsticks to make the following Roman numeral sequence. One, then two matchsticks to make a plus sign. Then a Roman numeral two. Plus Roman numeral three. Plus Roman numeral four.

It would look like this: I + II + III + IV.

The question is, can you move one matchstick, without removing it, still using them all — and make the above equation equal four? The RiddleDude can.

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1 + 11 – 111 = 1v

Nope

Move a matchstick from the second plus sign to the roman numeral two.

I + III – III + IV

The Riddledude thinks your equation equals five.

Check your math and try again.

-I – II + III + IV = Four

Yes! Take the vertical matchstick from the first plus sign and put it horizontally in front of the I.

Great job, Paul.

You’re today’s winner!

Would I – IV + III + IV work as well? (Making a V with the stick removed from the plus sign in front of II)

But you can only move one matchstick. In order to make the V, you’d have to move the stick, right?