K-12 Math Puzzles from the Math Forum
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1999 Puzzle - Judy Brown Use the digits in the year 1999 and the operations +, -, x, ÷, sqrt (square root),
^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for the counting numbers 1 through 100.
1998 Puzzle - Judy Brown Use the digits in the year 1998 and the operations +, -, x, ÷, sqrt (square root),
^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for the counting numbers 1 through 100.
1997 Puzzle - Ruth Carver Challenge: Using the digits in 1997 and any operations, try to write equations that have the numbers from 0 to 100 as the answer.
Four 4's Puzzle - Ruth Carver Challenge: Using four 4's and any operations, try to write equations that have the numbers from 0 to 100 as the answer.
1996 Puzzle - Ruth Carver Challenge: Using the digits in 1996 and any operations, try to write equations that have the numbers from 0 to 100 as the answer.
Can you connect the dots in a 3x3 grid using 4 straight lines?
Math Line Puzzles
Can you figure out how to plant 7 rosebushes so that they form 6 straight lines with 3 rosebushes in each line? Or 10 bushes in 5 lines with 4 in each? How about 19 in 9 lines with 5 in each?
Can you construct 9 triangles by drawing 3 straight lines through a capital M?
Can you move exactly two toothpicks to form four 1x1 squares?
A selection of brain teasers from Michael DiSpezio's new book, Critical Thinking Puzzles. Five puzzles, with solutions: Pyramid Passage, Spare My Brain, Putting It Together, Fractured Farmland, Kitchen Cups.
Critical Thinking Puzzles
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