Simple Math

Puzzles and brain teasers involving basic arithmetic and other simple math concepts – very little math knowledge required!

Missing Dollar Riddle

The missing dollar riddle is a classic brain teaser that can trip up even savvy puzzle solvers:

Three friends split the cost of a hotel room. They are charged $30, so each of them pays $10.

Later the hotel manager realized the room only cost $25 instead of $30. The manager brings $5 to reimburse the friends.

The manager finds it hard to split $5 three ways, so he gives the friends $1 each, and keeps $2 for himself.

But wait – each friend paid $9, for a total of $27, and the manager pocketed $2. That’s 27 + 2 = 29, whereas they originally handed over $30. Where did the missing dollar go?

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