DAY 280:

Today’s Challenge

. . . is to arrive at the target number of 18 by adding together exactly FIVE numbers.  You are limited to using digits 1 to 5 but these can be used any number of times in each calculation.

One way of making 18 is 5+5+5+2+1 (or 55521 to save time), so can you list the other SIX ways it is possible to make 18 in our 5puzzle challenge?

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

What is double the highest prime number on the list?

Make 280 Challenge

Can you arrive at 280 by inserting 7, 8, 9, 10 and 11 into the gaps below?

◯×◯×◯÷(◯–◯) = 280

Answers can be found here.

Click Paul Godding for details of online math tuition. Wherever you are in the world, please get in touch.

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