Author note — to cover

Multiples and common multiples, and the divisibility tests for 2, 3, 4, 5, 9 and 10 applied to three- and four-digit numbers. LCM method lives on lcm-from-prime-factors; primality testing by trial division lives on primes-and-primality. Both tiers. (N4)

• Fluency — direct questions on multiples and divisibility tests, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).