DAY 305:

Today’s Challenge

Another typical MATHELONA challenge taken from our pocket book of number puzzles.

Your task is to make all three lines work out arithmetically by replacing the 12 ◯’s with the following group of 12 numbers.  Can you successfully complete this?

1      1      2      2      2      3      4      4      5      6      7      8

◯  +  ◯   =     5     =   ◯  –  ◯
◯  +  ◯   =    10    =   ◯  ×  ◯
◯  +  ◯   =     2     =   ◯  ÷  ◯

Full details of our MATHELONA number puzzles can be found by clicking the link.

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 6th & 7th rows of the playing board contain the following fourteen numbers:

4    5    11    12    18    20    24    27    30    33    49    56    70    77

How many multiples of 7 are in the list?

Make 305 Challenge

Can you arrive at 305 by inserting 5, 6, 7, 8 and 9 into the gaps below?

(◯×◯+◯–◯)×◯ = 305

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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