Today’s Challenge
From all the odd numbers in the range 1-23 inclusive, eliminate all prime numbers and multiples of 3. Which is the only number to remain?
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.
The 3rd & 4th rows of the playing board contain the following fourteen numbers:
3 10 13 25 32 35 36 42 44 45 54 60 66 80
Which number, when 10 is added to it, becomes a square number?
Make 218 Challenge
Can you arrive at 218 by inserting 4, 5, 8 and 9 into the gaps below?
◯²+◯³+(6×◯÷◯) = 218
Answers can be found here.
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