Henry Ernest Dudeney/Puzzles and Curious Problems/358 - Simple Addition/Solution

by : $358$

 * Simple Addition

Solution

 * Express $4$ and $6$ in Roman numerals, perhaps using matches: $\text {IV}$ and $\text {VI}$.


 * Then turn $\text {IV}$ upside down and put it below $\text {VI}$, and see it makes $\text {XI}$.


 * This is $11$ in Roman numerals.