Prime Number Lab

Learning fit

Labels show who asserted each claim.

A primes lab for ages 9-13 with exact definitions throughout (prime = exactly two factors; 1 is neither prime nor composite). The Sieve walks the Sieve of Eratosthenes step by step on a 1-100 grid to reveal the 25 primes, with a tap-any-number factor inspector. Factor Trees guides trees for 12, 18, 24, 30, 36, 42, 48, and 60 with pair choices and prime factorization readouts. Prime or Not? runs 12 rounds including the classic traps 1, 51 (3x17), 57 (3x19), and 91 (7x13), each explained by its factor list.

Subjects

• Mathematics (Developer disclosed)

Skills

• prime and composite numbers (Developer disclosed)
• factors (Developer disclosed)
• prime factorization (Developer disclosed)
• Sieve of Eratosthenes (Developer disclosed)

Standards

Not verified

Practical details

No adult setup

Pricing notes: Not verified

Developer: Cogitare Labs

Browser or device

Not verified

Accountability

Material changes

No material public changes recorded.