The Main Challenge
Follow the rules below and eliminate every number from a given list, except one.
Firstly, list the multiples of 10 from 10 to 100 inclusive, then eliminate:
- multiples of 4
- factors of 100
- multiples of 3
Which is the only number that remains?
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 6th & 7th columns contain the following fourteen numbers:
5 7 9 24 28 30 32 36 40 49 50 54 64 66
How many multiples of 4 are listed?
The Factors Challenge
Which of the numbers below are factors of 352?
3 4 5 6 7 8 9 10 11 12 None of them
The Mathematically Possible Challenge
Using 1, 3 and 9 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
1 4 9 16 25 36 49 64 81 100
#SquareNumbers
The Target Challenge
Can you arrive at 352 by inserting 2, 4, 8, 11 and 16 into the gaps on each line?
- (◯+◯)×(◯+◯)–◯³ = 352
- ◯²×◯×◯×◯÷◯ = 352
Answers can be found here.
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