Dear number wizards, here's a good NumberWiz sum for us:
How do you add, subtract, multiply and divide 2 3 4 7 8 25 to get 739?
I'll be back tomorrow with a solution.
NumberWiz is a great Proctele app for the iPhone, iPod touch and the iPad.
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Showing posts with label iPhone app. Show all posts
Showing posts with label iPhone app. Show all posts
Saturday, July 2, 2011
Wednesday, December 15, 2010
NumberWiz examples
NumberWiz can present quite some challenges.
Here's an example. How do you apply addition, subtraction, multiplication and division to make the number 390 out of the numbers 3 7 8 9 75 100 ?
A solution: (8-3) x 9 x 7 + 75 = 5 x 67 + 75. Creativity certainly helps.
How then do you make the number 640 out of the numbers 6 7 8 9 9 50 ?
One solution is: ((9x9) - (7-6)) x 8 = 80 x 8 = 640. Less difficult than the previous.
Here's an example. How do you apply addition, subtraction, multiplication and division to make the number 390 out of the numbers 3 7 8 9 75 100 ?
A solution: (8-3) x 9 x 7 + 75 = 5 x 67 + 75. Creativity certainly helps.
How then do you make the number 640 out of the numbers 6 7 8 9 9 50 ?
One solution is: ((9x9) - (7-6)) x 8 = 80 x 8 = 640. Less difficult than the previous.
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