The Main Challenge
Which is the only 2-digit number to have exactly SEVEN factors?
. . . and an additional challenge for the number puzzle enthusiast; which is the only 3-digit number to have exactly SEVEN factors?
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 4th & 5th rows contain the following fourteen numbers:
3 6 7 10 16 21 32 35 44 50 54 60 81 84
What is the sum of the two square numbers?
The Factors Challenge
Which is the ONLY number on the following list that is a factor of 299?
3 5 7 9 11 13 15 17 19
The Mathematically Possible Challenge
Using 3, 8 and 10 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
6 12 18 24 30 36 42 48 54 60
#6TimesTable
The Target Challenge
Can you arrive at 299 by inserting 8, 9, 10, 11 and 12 into the gaps below?
- (◯+◯)×◯+(◯×◯) = 299
Answers can be found here.
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