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FAQs with keywords: coins - 4 items found
Classic Problems
Classic problems from the Ask Dr. Math FAQ (Frequently Asked Questions) files, including: age word problems, birthday probability, boy or girl?, camel and bananas, coin problems, doubling pennies, grazing animals, liars and truthtellers, the missing dollar, Monty Hall (three doors), three houses three utilities, the Tower of Hanoi, two trains, two trains and a fly, and working together.

Coin Problems
Tony has 11 more nickels than quarters. How many coins does he have if the total value of his coins is $2.65?

Probability in the Real World
An introduction to the uses of probability in everyday life, including: weather forecasting, flipping coins, batting averages, lightning strikes, and the lottery.

Roman Numerals
Basics: How do I read and write Roman numerals? What are the rules for subtracting letters? How do I write large numbers? Web resources: introductions, charts, calculators, and converters. Calculations: Did the Romans use fractions? How can I use Roman numerals to do arithmetic problems? Uses Past and Present: How did the Romans use math? How are Roman numerals used today? With links to resources for other numeral systems.