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Puzzle

Time Marches On

Time Marches On

This week’s Puzzle Corner activity is a simple problem with surprising results. The question posed in the puzzle is: “How many times during a day (24 hours) do the hour and minute hands of a clock point in the same direction?” The obvious answer seems to be 24, yet this is not correct. Students are… Continue Reading

Five Squares, One Square

Five Squares, One Square

A while back I posted a five triangle puzzle that involved putting together five 30-60-90 triangles to form a single triangle. Of all of the dozens of puzzles that I own and have made over the years, that is one of my favorites because of the opportunities it provides for students to think about important… Continue Reading

April Riddles

This week’s Puzzle Corner activity is a collection of riddles that are appropriate for the week that begins with April Fool’s Day. These riddles are the types of brainteasers loved by mathematicians and other people who enjoy mental challenges. Solving them will take logical reasoning, thinking outside the box, and persistence. These problem-solving skills are… Continue Reading

The Five Triangle Puzzle: Solutions

The Five Triangle Puzzle: Solutions

The Five Triangle Puzzle was the subject of a post back on February 11. I’m hopeful that some of you will have downloaded the pieces and solved the puzzle. The challenge was to put all five pieces together to form a triangle and then to determine if there were other triangles that could be formed… Continue Reading

The Five Triangle Puzzle: Composing and Decomposing

The Five Triangle Puzzle: Composing and Decomposing

Beginning in first grade and continuing through the grades, the Common Core Math Standards emphasize composing and decomposing shapes. One way to give students experience with composing shapes is through put-together puzzles. Actually, working at put-together puzzles involves lots of composing and decomposing. Sometimes what we compose is a solution; sometimes it’s not. While the… Continue Reading