What is the biggest number you can make by moving exactly 2 matches in the number above?
Assume that numbers must be represented in their standard “digital clock” font (for example, a “1” requires two segments).
Continue reading “Match Maximization”
Simple Math
Puzzles and brain teasers involving basic arithmetic and other simple math concepts – very little math knowledge required!
Swap Digits
Swap two of the digits in this equation to make it a valid equation:
7 x 7 + 9 x 9 = 138
Continue reading “Swap Digits”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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