Puzzles
Multiples of three
If the digits of a number add up to a multiple of three, then the number is a multiple of three. Therefore if a two digit number, \(AB\) (first digit \(A\), second digit \(B\); not \(A\times B\)), is a multiple of three, then \(A0B\) is also a multiple of three.
If \(AB\div 3=n\), then what is \(A0B\div 3\)?
If you enjoyed this puzzle, check out Sunday Afternoon Maths XIX,
puzzles about numbers, or a random puzzle.
puzzles about numbers, or a random puzzle.