DAY 211:

The Main Challenge

As well as 9421 (9+4+2+1), list the SEVEN other ways of making 16 when adding together four unique digits from 1 to 9.

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

2   8   9   14   15   17   22   28   40   48   55   63   64   72

Which THREE different numbers have a sum of 111?

The Lagrange Challenge

Lagrange’s Four-Square Theorem states that every positive integer can be made by adding up to four square numbers.

For example, 7 can be made by 2²+1²+1²+1² (or 4+1+1+1).

There are SEVEN different ways to make 211 when using Lagrange’s Theorem. How many can you find?

The Mathematically Possible Challenge

Based on our best-selling arithmetic board game.

Using 57 and 11 once each, with + – × ÷ available, which is the ONLY number it is possible to make from the list below?

2    4    6    8    10    12    14    16    18    20

#EvenNumbers

The Target Challenge

Can you arrive at 211 by inserting 121314 and 15 into the gaps on each line?

  •  ◯×◯+◯–◯ = 211
  •  ◯²+◯×(◯–◯) = 211

Answers can be found here.

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