← Arcade
Score: 0 / 0
🔢 Factor & Multiple Finder
HK Primary 5 · Highest Common Factor (HCF) & Lowest Common Multiple (LCM)
The 1–100 Grid
Pick two numbers. The grid lights up their factors or their multiples. Numbers that belong to both turn purple — the biggest shared factor is the HCF, the smallest shared multiple is the LCM.
12
18
belongs to A
belongs to B
belongs to both
Your turn
Find the HCF or LCM for each pair, type your answer, then press Check. Press New questions for a fresh set.