A LITTLE SOMETHING WORTH KNOWING
A small discovery. Yours to pass on.
Math & LogicOne small ahaProduct19 × 20
Think it. Then flip it.✳ ahamoraTap to reveal ↻Back to the cue ↶
Math & LogicOne small aha
Your new aha380
✳ ahamoraReference ↗19 groups of 20 make 380. Reversing the factors, 20 × 19, gives the same product. Source: Multiplication table ↗