DAY 66:

Today’s Challenge

When multiplying two numbers together and then adding/subtracting a third number, there are four ways of reaching 60 when the three numbers used in each calculation are in the range 1-9 (which can be repeated).

One way to make 60 is (9×6)+6; can you find the other three?

[Note:  (9×6)+6 and (6×9)+6 counts as just one way.]

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 3rd & 5th rows contain the following fourteen numbers:

6   7   13   16   21   25   36   42   45   50   66   80   81   84

How many pairs of consecutive numbers are there?

Make 66 Challenge

Can you arrive at 66 by inserting 2, 3, 4 and 9 into the gaps on each line?

  •  (◯×◯+◯)× = 66
  •  (◯×◯–◯)× = 66
  •  ◯²×◯+◯× = 66
  •  ◯³+(◯+◯)²+√◯ = 66

Answers can be found here.

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