Broken
Calculator Challenge – Target 25 |
Teachers page |
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Go to: http://seeingmath.concord.org/broken_calculator/ and "break" the 1, 8, 5, 2, 0, 3 and - (minus) keys. List all the different ways you can make 25 on this calculator with keys that are NOT broken. The first one is done for you.
(Only keys that work are: 7, divide, 4, 6, mulitply, open and
close parenthesis, add, equal, and cancel.) Create more challenges for the students to do! Learn More Try some more Broken Calculator challenges at and http://www.mathcats.com/microworlds/broken_calculator.html Tuesday's lesson - what you can do with a Broken Calculator? http://www.concord.org/publications/newsletter/2005-fall/tuesday.html On-math article: Learning Number Sense from a Broken Calculator Judah Schwartz, George & Judith Collison https://my.nctm.org/eresources/view_article.asp?article_id=7457&page=1 |