DAY 180:

Today’s Challenge

This is a continuation of a number puzzle, posted on DAY 10, made famous by French writer George Perec.

In that challenge, we asked you to use seven 7’s (7, 7, 7, 7, 7, 7 and 7) once each, with + – × and ÷ available, to make target numbers from 1 to 3.

To carry on the pattern, and make 4, you could simply do:

  •  7 – [(7÷7) + (7÷7) + (7÷7)] = 4

We now invite you to make all the target numbers from 5 through to 9.

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 1st & 6th rows contain the following fourteen numbers:

2    5    9    12    14    15    18    20    22    33    40    49    56    72

What is the sum of the multiples of 8?

Make 180 Challenge

Can you arrive at 180 by inserting 4, 6, 8 and 10 into the gaps below?

(◯+◯)×(◯+◯) = 180

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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