DAY 255:

The Main Challenge

Here’s a 2-part, 7-step number trail involving all four arithmetical operations.

Part 1: When starting with the number 15, what is your final answer?

  • 1
  • +2
  • ×3
  • ÷4
  • +5
  • 6
  • ×7

Part 2: In a separate calculation, what must your starting number be to make your final answer 3.5?

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 & 6th rows contain the following fourteen numbers:

5   8   12   17   18   20   28   33   48   49   55   56   63   64

Which number, when 11 is added to it, becomes a square number?

The Factors Challenge

Which of the following numbers are factors of 255?

2     3     4     5     6     7     8     9     10

Today’s Hint: A number is a multiple of 5 if it ends in a 5 or 0 ]

The Mathematically Possible Challenge

Based on our best-selling arithmetic board game.

Using 58 and 11 once each, with + – × ÷ available, which is the ONLY number 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 255 by inserting 2, 4, 5, 6 and 10 into the gaps below?

  •  (◯×◯+◯÷◯)×◯ = 255

Answers can be found here.

Click Paul Godding for details of online maths tuition.

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