Question:
How can you take 9 toothpicks and make ten without breaking the toothpicks?
Answer:
TEN (every line making the letters in the word ten is one toothpick. There are nine lines you draw when writing ten, so there are 9 toothpicks making TEN).
Try another Brain Teaser:
If 7 is transformed into 13 and 11 is changed to 21 then what does 16 become?