DAY 273:

The Main Challenge

Starting with the number 70, keep on subtracting consecutive prime numbers from the previous total (2, 3, 5, …) until your answer becomes negative. What is this negative number?

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 2nd & 7th rows contain the following fourteen numbers:

4   8   11   17   24   27   28   30   48   55   63   64   70   77

What is the sum of the multiples of 6?

The Factors Challenge

Which of the following numbers are factors of 273?

3     5     7     9     11     13     None of them

The Mathematically Possible Challenge

Using 37 and once each, with + – × ÷ available, which are the only THREE numbers it is possible to make from the list below?

30    31    32    33    34    35    36    37    38    39

#NumbersIn30s

The Target Challenge

Can you arrive at 273 by inserting 1, 3, 5, 7 and 9 into the gaps below?

  •  (◯+◯–◯)×◯×◯ = 273

Answers can be found here.

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