day/dydd 1 at 7puzzleblog.com

The Main Challenge

You have rolled the numbers 1, 2 and 4 with three dice.

This is a truly unique combination, being the only one where you can make ALL ten target numbers from 1-10, using + – × ÷ as seen below.

Can you place 1, 2 and 4 into the three gaps on each line so all ten calculations work out?

  •  ◯–(◯+◯)  =  1
  •  ◯×◯–◯  =  2
  •  ◯÷◯+◯  =  3
  •  ◯×(◯–◯)  =  4
  •  ◯+◯–◯  =  5
  •  ◯×◯+◯  =  6
  •  ◯×◯–◯  =  7
  •  ◯×◯×◯  =  8
  •  ◯×◯+◯  =  9
  •  ◯×(◯+◯)  =  10

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 1st & 2nd rows contain the following fourteen numbers:

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

What is the sum of all the multiples of 5?

The Roll3Dice Challenge

In six of the seven groups below, it is possible to make today’s target number of 1 when each number in the group is used once, with + – × ÷ available:

  •   1   1   1
  •   1   2   5
  •   1   6   6
  •   2   2   5
  •   2   3   6
  •   3   3   5
  •   3   4   6

But, which is the only group that CANNOT make 1?

The Mathematically Possible Challenge

Using 45 and 10 once each, with + – × ÷ available, which THREE numbers is it possible to make from the list below?

3    6    9    12    15    18    21    24    27    30

#3TimesTable

The Target Challenge

Can you arrive at 1 by inserting 2, 4, 6 and 8 into the four gaps on each line?

  •  (+◯)÷(◯+◯) = 1
  •  (◯×◯)÷(◯+◯) = 1
  •  (◯–◯)–(◯÷◯) = 1
  •  (◯+◯–◯)÷◯ = 1
  •  ◯²÷(◯+◯+◯) = 1

Answers can be found here.

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