Find Prime Numbers
by Anonymous
Cross out multiples from the smallest prime and see which 25 numbers stay prime between 1 and 100.
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About this app
Find Prime Numbers is an interactive elementary math learning app about prime and composite numbers from 1 to 100. Students can use a step-by-step Sieve of Eratosthenes to cross out multiples and reveal the 25 primes, inspect divisors for individual numbers, and answer a short prime-or-composite quiz.
Use cases
- Elementary students learning prime numbers
- Teachers demonstrating the Sieve of Eratosthenes
- Learners practicing factors and multiples
- Families reviewing fifth-grade math concepts
Features
- Step-by-step and complete Sieve of Eratosthenes activities for 1–100
- Interactive divisor display with adjustable numbers
- Missions for finding numbers with specific divisor counts
- Four-question prime-or-composite quiz with score tracking
- Reset and next controls for guided practice