DAY 281:

The Main Challenge

If you wrote down all single-digit numbers and factors of 80, how many different numbers would be on your list?

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 1st & 6th rows contain the following fourteen numbers:

2   5   9   12   14   15   18   20   22   33   40   49   56   72

As well as 2+12(=14), find the other SEVEN pairs of numbers whose sum is also listed.

The Factors Challenge

Which of the following numbers are factors of 281?

3     5     7     9     11     13     None of them

The Mathematically Possible Challenge

Using 27 and 10 once each, with + – × ÷ available, which are the only THREE numbers it is possible to make from the list below?

9    18    27    36    45    54    63    72    81    90

#9TimesTable

The Target Challenge

Can you arrive at 281 by inserting 1, 2, 3, 4 and 5 into the gaps below?

  •  (◯³+◯²)×(◯–◯)+◯² = 281

Answers can be found here.

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