There are 30 sand castles in a box and 9 are taken out. How many sand castles are left?
21 sand castles.
30 - 9 = 21.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Easy. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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