The Main Challenge
Starting with the number 70, keep on subtracting consecutive prime numbers from the previous total (2, 3, 5, …) until your answer first becomes negative. What is this negative 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 & 7th rows contain the following fourteen numbers:
4 8 11 17 24 27 28 30 48 55 63 64 70 77
What is the sum of the multiples of 6?
The Factors Challenge
Which of the following numbers are factors of 273?
3 5 7 9 11 13 None of them
The Mathematically Possible Challenge
Using 3, 7 and 9 once each, with + – × ÷ available, which are the only THREE numbers it is possible to make from the list below?
30 31 32 33 34 35 36 37 38 39
#NumbersIn30s
The Target Challenge
Can you arrive at 273 by inserting 1, 3, 5, 7 and 9 into the gaps below?
- (◯+◯–◯)×◯×◯ = 273
Answers can be found here.
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