DAY/DYDD 257:

T he Main Challenge

When using the numbers 2, 5 and 7 once each, with + – × ÷ available, can you list the TWELVE target numbers from 1-30 that are mathematically possible to achieve?

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from up to 84.

The 3rd & 7th rows contain the following fourteen numbers:

4   11   13   24   25   27   30   36   42   45   66   70   77   80

Which three different numbers have a sum of 77?

The Factors Challenge

Which of the following numbers, if any, are factors of 257?

3     5     7     9     11     13     None of them

The Mathematically Possible Challenge

Using 58 and 11 once each, with + – × ÷ available, which are the only TWO numbers it is possible to make from the list below?

2    3    5    7    11    13    17    19    23    29

#PrimeNumbers

The Target Challenge

Can you arrive at 257 by inserting 2, 4, 5, 8 and 9 into the gaps below?

  •  ◯²×◯+×(7+◯+◯) = 257

Answers can be found here.

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