DAY 347:

Today’s Challenge

How many 3-digit numbers contain at least two 7’s?

If you have an answer, comment below or send us a tweet at @7puzzle.

The 7puzzle Challenge

The playing board of the 7puzzle game is a 7-by-7 grid containing 49 different numbers, ranging from 2 up to 84.

The 4th & 7th columns of the playing board contain the following fourteen numbers:

3    5    6    9    20    24    28    32    42    50    63    66    72    77

Which five numbers become prime numbers when 5 is added to each of them?

Make 347 Challenge

Can you arrive at 347 by inserting 2, 4, 5, 10 and 20 into the gaps below?

²–[◯²+(◯+◯)×◯)] = 347

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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