The Main Challenge
What is the biggest number you can make when using the four digits 1 2 3 4 and following these rules:
- you can use brackets and + – × ÷ as often as you like,
- you cannot use any number more than once,
- you must use all four numbers exactly once each,
- you cannot use powers/indices,
- you cannot put numbers together (using 1, 2 and 3 to make 123, for example).
Good luck and enjoy!
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 4th & 7th rows contain the following fourteen numbers:
3 4 10 11 24 27 30 32 35 44 54 60 70 77
Find three different numbers that have a sum of 100.
The Factors Challenge
Which is the ONLY number from the following list that is a factor of 289?
3 5 7 9 11 13 15 17 19
The Mathematically Possible Challenge
Using 8, 10 and 12 once each, with + – × ÷ available, which are the FOUR numbers it is possible to make from the list below?
5 10 15 20 25 30 35 40 45 50
#5TimesTable
The Target Challenge
Can you arrive at 289 by inserting 2, 3, 4, 6 and 7 into the gaps below?
- (◯×◯–◯)²+◯²–◯² = 289
Answers can be found here.
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