Math Forum - Problems Library - Pre-Algebra, Number Theory: Prime Numbers

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 number theory
  divisibility rules
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Pre-Algebra
operations with numbers
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Prime Numbers
These problems provide practice with prime factorization in problem solving and mathematical reasoning.

Related Resources
Interactive resources from our Math Tools project:
   Math 7: Number Theory
The closest match in our Ask Dr. Math archives:
   FAQ: Prime Numbers
NCTM Standards:
   Number and Operations Standard for Grades 6-8

Access to these problems requires a Membership.

Coding Conundrums - Mary DeYoung & class
Pre-Algebra, difficulty level 2. Explore encoding and decoding in this cipher puzzle. ... more>>

Counting Chicken Wings - Annie Fetter, Suzanne Alejandre
Pre-Algebra, difficulty level 3. Figure out how many wings are in the Biggest Bucket O' Wings. ... more>>

Divisible by a Dozen - Terry Trotter & Annie Fetter
Pre-Algebra, difficulty level 3. If you take any three consecutive integers, multiply the first times the square of the second, then multiply by the third, is 12 a factor of the product? ... more>>

An Interesting Integer - Judy Ann Brown
Pre-Algebra, difficulty level 2. I'm thinking of a particular integer. It is a multiple of three, five, and seven. No digit occurs more than once. Can you find my number? ... more>>

Open and Shut Case - Judy Ann Brown
Pre-Algebra, difficulty level 2. Find the locker combination using mathematical clues. ... more>>

Palindrome Day - Judy Ann Brown
Pre-Algebra, difficulty level 2. How many Palindrome Days are there in a year? ... more>>

Prime Probability - Lisa Lavelle
Pre-Algebra, difficulty level 3. Given the expression n^2 - 5, what is the probability that the result is prime for integers between 2 and 12? ... more>>

Treasure Hunt Math - Judy Ann Brown
Pre-Algebra, difficulty level 3. Use clues to find the mystery palindrome. ... more>>

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