A Keith Number, made famous by Mike Keith, is worked out in a not-too-dissimilar way to Fibonacci Numbers. If you like playing around with numbers, have a go at this fun concept. The first 2-digit Keith Number, 14, is worked out as follows:
- Try 14: 1+4=5; 4+5=9; 5+9=14 (the total arrives back to the original number).
By following this pattern, can you find the next 2-digit Keith Number?
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84.
The 2nd & 3rd rows contain the following fourteen numbers:
8 13 17 25 28 36 42 45 48 55 63 64 66 80
Which three numbers, when 6 is added to them, each become multiples of 7?
Make 187 Challenge
Can you arrive at 187 by inserting 4, 5, 7 and 9 into the gaps below?
(◯×◯×◯)+◯ = 187
Answers can be found here.
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