The Main Challenge
Try this number trail involving 14 arithmetical steps. Start with 16, then:
- ÷4
- one-half of this
- ×7
- –7
- ×8
- add seventeen
- +7
- 1/10 of this
- –2
- ×13
- one-third of this
- ÷2
- +43
- 1/7 of this
What is your final answer?
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 3rd & 5th rows contain the following fourteen numbers:
6 7 13 16 21 25 36 42 45 50 66 80 81 84
From the list, how many multiples of 5 are present?
The Factors Challenge
Which of the following numbers are factors of 279?
3 5 7 9 11 13 None of them
The Mathematically Possible Challenge
Using 2, 7 and 10 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
7 14 21 28 35 42 49 56 63 70
#7TimesTable
The Target Challenge
Can you arrive at 279 by inserting 2, 4, 6, 8 and 10 into the gaps below?
- (◯³÷◯)+(◯÷◯)³+³√◯ = 279
Answers can be found here.
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