DAY 15:

Today’s Challenge

Your task is to multiply two numbers together and then subtract a third number to achieve the target answer of 7. The three numbers used in each calculation must all be unique digits from 1-9.

For example, one such way of making 7 is (4×3)5. Can you find SIX other ways to make 7?

[Note:  (4×3)5 = 7  and  (3×4)5 = 7  counts as ONE way]

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 5th & 6th rows of the playing board contain the following fourteen numbers:

5   6   7   12   16   18   20   21   33   49   50   56   81   84

What answer do you get when subtracting the total of the prime numbers from the sum of the multiples of 10?

Make 15 Challenge

Can you arrive at 15 by inserting 2, 3, 5 and 6 into the gaps on each line?

  •  ◯×◯+◯◯ = 15
  •  ◯÷ײ×◯ = 15
  •  ◯²–(◯+◯)× = 15

Answers can be found here.

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