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 by doing (4×3)5, so can you find the other SIX ways you can make 7?

[Note:  (4×3)5=7  and  (3×4)5=7  counts as just 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

Subtract the total of the prime numbers from the sum of the multiples of 10. What answer do you get?



. . . can be found when clicking this.


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