A LITTLE SOMETHING WORTH KNOWING
A small discovery. Yours to pass on.
Math & LogicOne small ahaProduct5 × 9
Think it. Then flip it.✳ ahamoraTap to reveal ↻Back to the cue ↶
Math & LogicOne small aha
Your new aha45
✳ ahamoraReference ↗5 groups of 9 make 45. Reversing the factors, 9 × 5, gives the same product. Source: Multiplication table ↗