Today’s Challenge
From the numbers 1 to 20 inclusive, find the only one that remains when all square numbers, multiples of 6, factors of 40 and odd numbers are eliminated.
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 1st & 6th rows contain the following fourteen numbers:
2 5 9 12 14 15 18 20 22 33 40 49 56 72
How many square numbers are present?
Make 72 Challenge
Can you arrive at 72 by inserting 4, 6, 8 and 10 into the gaps on each line?
- ◯×◯+◯+◯ = 72
- ◯×◯–(◯+√◯) = 72
- (◯+◯)×◯+◯ = 72
Answers can be found here.
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