Math Arguments
Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.
House Numbers
The houses on River Road are numbered consecutively from 10 to 132. Each house number is made with brass digits.
#105 would take 3 digits, for example.
1. How many brass digits are needed to form all the house numbers?
2. The numbers can be purchased for $2.29 each or $20.95 per dozen (of the same digit). What is the cheapest combination of numbers that you can arrange?
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Source:
Aldo Bianchi
More Information:
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