☰ Contents1.2 · The Fundamental Theorem of Arithmetic32/101

Three numbers at once

The same reading works for three numbers — line up all three factorisations. 6 = 2 × 3, 72 = 23 × 32, 120 = 23 × 3 × 5 → HCF = 2 × 3 = 6, LCM = 23 × 32 × 5 = 360.