DAY 121:

Today’s Challenge

Read the following facts below about a particular number:

  •  I am a 2-digit number,
  •  I am an even number,
  •  When my two digits are added together they make another 2-digit even number that is also a square number.

What is my number?

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 1st & 7th rows of the playing board contain the following fourteen numbers:

2   4   9   11   14   15   22   24   27   30   40   70   72   77

What is the difference between the sum of the multiples of 11 and the sum of the multiples of 10?

Make 121 Challenge

Can you arrive at 121 by inserting 4, 5, 6 and 7 into the gaps on each line?

  •  (◯+◯)×(◯+◯) = 121
  •  (◯+◯)²×(◯–◯) = 121
  •  ◯³–◯×(◯–◯) = 121

Answers can be found here.

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