Three plus nine made with matchsticks.

Move two matchsticks to get an odd number.

This puzzle was published on the New Scientist.

Solution
Zero plus five made with matchsticks.
Three times nine made with matchsticks.
Five plus zero made with matchsticks.
Five plus six made with matchsticks.
Six plus three made with matchsticks.
Six plus five made with matchsticks.
Eight minus three made with matchsticks.
Eight minus five made with matchsticks.
Nine minus zero made with matchsticks.
Nine plus two made with matchsticks.
Nine minus six made with matchsticks.

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