DAY 28:

Today’s Challenge

. . . is an introductory MATHELONA challenge taken from the cover of Volume 1 of my pocket book series.

Can you insert the digits 1, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5 and 6 into the 12 gaps below so all three lines work out arithmetically?

◯  +  ◯   =    3    =   ◯  –  ◯
◯  +  ◯   =    4    =   ◯  ×  ◯
◯  +  ◯   =    5    =   ◯  ÷  ◯

The 7puzzle Challenge

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

The 3rd & 6th rows of the playing board contain the following fourteen numbers:

5   12   13   18   20   25   33   36   42   45   49   56   66   80

What is the sum of the odd numbers listed above?

Make 28 Challenge

Can you arrive at 28 by inserting 2, 4, 6 and 8 into the gaps on each line?

  •  ◯×◯+◯–◯ = 28
  •  ◯×◯÷◯+◯ = 28
  •  ◯×◯+◯×√◯ = 28
  •  ◯×◯+◯÷◯ = 28
  •  (◯+◯)×◯–◯ = 28
  •  (◯+◯)×◯÷◯ = 28
  •  (◯+◯)×+◯ = 28

Answers can be found here.

Click Paul Godding for details of online maths tuition. Wherever you are in the world, please get in touch.

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