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Prime Numbers

These problems provide practice with identifying prime numbers, and may also contain concepts of prime factorization and composite numbers.
 Related Resources

Interactive resources from our Math Tools project:
Math 4: Number Theory
The closest match in our Ask Dr. Math archives:
FAQ: Prime Numbers
NCTM Standards:
Number and Operations Standard for Grades 35
Access to these problems requires a Membership.

Birthday Probability
 Kristina Lasher & Lisa Lavelle

Math Fundamentals, difficulty level 3. What is the likelihood that someone is born on an even or odd day of
the month? Are you more likely to be born on a prime number day or a
multiple of 3?
... more>>

Cicada Circus
 Kristina Lasher and special thanks to John Cooley

Math Fundamentals, difficulty level 2. Use the table of information about periodical cicadas to figure out when
the next time is that there will be three years in a row without an
emergence.
... more>>

Five Digits of Fun
 Lisa Lavelle

Math Fundamentals, difficulty level 4. Find a fivedigit number based on these clues.
... more>>

Four Playful Mathematicians
 inspired by Maria Fung's class at Western Oregon

Math Fundamentals, difficulty level 2. Follow the clues to help the four playful mathematicians return the lost watch.
... more>>

In Their Prime
 Claire Mead

Math Fundamentals, difficulty level 2. Use the clues about multiples and primes to figure out how old
Jonathan and Hazel are.
... more>>

Jellybean Fractions
 Lisa Lavelle

Elementary, difficulty level 2. Determine good and bad choices in playing the Jellybean Fractions Game.
... more>>

Summer Shoe Leftovers
 Teaching the Young Learner Group

Math Fundamentals, difficulty level 4. Determine which of the leftover shoes might satisfy three shoppers' needs.
... more>>
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