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1999 Puzzle- Judy BrownUse 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 BrownUse 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 CarverChallenge: 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 CarverChallenge: 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 CarverChallenge: 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

Critical Thinking Puzzles.Five puzzles, with solutions: Pyramid Passage, Spare My Brain, Putting It Together, Fractured Farmland, Kitchen Cups.

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