DAY 261:

Today’s Challenge

Your task is to make all four lines below work out arithmetically by replacing the 16 ◯’s with digits from 0 to 9, but each digit can only be used a maximum of twice!

Can you complete this MATHELONA challenge?

◯  +  ◯   =    9    =   ◯  +  ◯
◯  +  ◯   =    3    =   ◯  –  ◯
◯  +  ◯   =    8    =   ◯  ×  ◯
◯  +  ◯   =    2    =   ◯  ÷  ◯

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 & 5th rows contain the following fourteen numbers:

2    6    7    9    14    15    16    21    22    40    50    72    81    84

What is the sum of the multiples of 7?

Make 261 Challenge

Can you arrive at 261 by inserting 1, 2, 3, 4 and 5 into the gaps below?

(◯××)²+(◯+◯)² = 261

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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