The Main Challenge
Follow the rules and eliminate every number, except one.
From the numbers 1-50, eliminate:
- all numbers containing 1, 3, 5 or 7
- even numbers
- square numbers
There is just one number left, which one?
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 & 5th columns contain the following fourteen numbers:
4 8 11 12 14 15 17 18 25 35 44 80 81 84
What is the difference between the highest multiples of 8 and 9?
The Factors Challenge
Which is the ONLY number below that is a factor of 343?
3 5 7 9 11 13 15 17 19
The Mathematically Possible Challenge
Using 2, 9 and 12 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?
100 101 102 103 104 105 106 107 108 109
#Numbers100to109
The Target Challenge
Can you arrive at 343 by inserting 1, 2, 3, 4 and 5 into the gaps on each line below?
- (◯+◯+◯–◯–◯)³ = 343
- (◯×◯×◯–◯×◯)³ = 343
Answers can be found here.
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