DAY 233:

Today’s Challenge

Firstly, write down three separate lists only containing numbers in the range 1 to 100:

  •  List 1 – multiples of 9
  •  List 2 – factors of 108
  •  List 3 – triangular numbers

Part 1: Which is the only number present on all three lists?

Part 2: List the eight other numbers that are on exactly two of the lists?

Part 3: How many different numbers are listed altogether?

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 2nd & 4th rows of the playing board contain the following fourteen numbers:

3    8    10    17    28    32    35    44    48    54    55    60    63    64

From the list, what is the sum of the even numbers?

Make 233 Challenge

Can you arrive at 233 by inserting 11, 12, 13, 14 and 15 into the gaps below?

6×◯+5×◯+4×◯+3×◯–◯ = 233

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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