DAY 347:

The Main Challenge

How many 3-digit numbers contain at least two 7’s?

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 & 7th columns contain the following fourteen numbers:

3   5   6   9   20   24   28   32   42   50   63   66   72   77

Which FIVE numbers become prime numbers when 5 is added to each of them?

The Factors Challenge

Which numbers below are factors of 347?

3    5    7    9    11    13    None of them

The Mathematically Possible Challenge

Using 13 and once each, with + – × ÷ available, which SIX numbers is it 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 347 by inserting 2, 4, 5, 10 and 20 into the gaps below?

  •  ◯²–◯²–◯×(◯+◯) = 347

Answers can be found here.

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