DAY 251:

The Main Challenge

Here’s a special 24game-type challenge with a difference.

Using the numbers 1, 3, 4 and 6 once each, together with + – × ÷ available, it is possible to make lots of different target numbers, not just 24.

For instance:

  • to make 1: (3+4–6)×1 = 1
  • to make 2: (3+4–6)+1 = 2
  • to make 3: (6–4–1)×3 = 3 . . . and so on.

Using the same four numbers, can you make the target numbers 6, 12, 18 and 24?

The 7puzzle Challenge

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

The 2nd & 6th rows of the playing board contain the following fourteen numbers:

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

What is the sum of the multiples of 5?

The Factors Challenge

Which of the following numbers, if any, are factors of 251?

2    3    4    5    6    7    8    9    10    None of them

[ Today’s Hint: An even number cannot divide exactly into an odd number ]

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?

5    10    15    20    25    30    35    40    45    50

#5TimesTable

The Target Challenge

Can you arrive at 251 by inserting 10, 20, 30, 40 and 50 into the gaps below?

  •  (quarter of ◯)×◯–[(◯+◯)÷◯]² = 251

Answers can be found here.

Click Paul Godding for details of online maths tuition.

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