2012 Puzzle |
2011 Puzzle |
2010 Puzzle |
2009 Puzzle |
2007 Puzzle
2006 Puzzle |
2005 Puzzle |
2004 Puzzle |
2003 Puzzle |
2002 Puzzle |
2001 Puzzle
2000 Puzzle |
1999 Puzzle |
1998 Puzzle
- Judy Ann Brown
Use the digits in the years 2009, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, or 1998 and the operations of +, -, x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for the counting numbers 1 through 100.
All the King's Digits - Terry Trotter
Challenge: Using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9, and the operations of +, -, x, ÷, sqrt (square root), cbrt (cube root), ^ (raise to a power), and ! (factorial), along with grouping symbols, write expressions for the counting number 100.
1997 Puzzle - Ruth Carver - 1996 Puzzle
Challenge: Using the digits in 1997 or 1996 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.
Can you connect the dots in a 3x3 grid using 4 straight lines? 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.
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