The Main Challenge
This is a typical number puzzle from fellow designer, Kojiro Tominga, who is based in Yokohama, Japan.
Using 5, 5, 5 and 5, with + – × ÷ available, can you make each of the target numbers 5, 10, 15, 20, 25, 30 and 35?
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 double the lowest multiple of 9 found on the list?
The Factors Challenge
Which THREE of the following numbers are factors of 297?
3 5 7 9 11 13 15 17
The Mathematically Possible Challenge
Using 8, 10 and 12 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?
100 102 104 106 108 110 112 114 116 118 120
#EvenNumbers
The Target Challenge
Can you arrive at 297 by inserting 1, 2, 3, 4 and 5 into the gaps below?
- ◯²×(◯+◯)×(◯²–◯) = 297
Answers can be found here.
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