DAY 284:

Today’s Challenge

Another MATHELONA challenge with a difference – no addition calculations at all.

Your task is to make all four lines work out arithmetically by replacing the 16 ◯’s with digits from 0 to 9.  Each digit can only be inserted a maximum of twice:

◯  –  ◯   =    9    =   ◯  ×  ◯
◯  –  ◯   =    7    =   ◯  ÷  ◯
◯  –  ◯   =    5    =   ◯  ×  ◯
◯  –  ◯   =    3    =   ◯  ÷  ◯

Full details of our popular number puzzle can be found by clicking MATHELONA.

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

Which two numbers, when doubled, are also on the list?

Make 284 Challenge

Can you arrive at 284 by inserting 5, 6, 8, 9 and 11 into the gaps below?

(◯²+◯²)×√◯–(◯+◯) = 284

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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