DAY 299:

Today’s Challenge

Which is the only 2-digit number to have exactly seven factors?

. . . and an additional challenge for the number puzzle enthusiast; which is the only 3-digit number to have exactly seven factors?

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

3    6    7    10    16    21    32    35    44    50    54    60    81    84

What is the sum of the two square numbers?

Make 299 Challenge

Can you arrive at 299 by inserting 8, 9, 10, 11 and 12 into the gaps below?

(◯+◯)×◯+(◯×◯) = 299

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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