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 Arithmo Basic Rules:

  • To find or insert in a grid three adjacent numbers that when calculated together result in an Equa-X. 
  • Equa and Equa-X are terms that simply mean the result of a mathematical equation. For example: 2 x 4 -1 = 7 (Equa-7)
  • In Arithmo, an equation is made by connecting three adjacent numbers in a grid.  
  • There are five types of puzzle grid shapes: Circle, Hexagon, Rhombus, Square, Triangle. Each game has a diagram illustrating how connections should be made in its specific grid.
  • Numbers are calculated together using only addition, subtraction, multiplication and division, with or without parenthesis.

If a combination of arithmetic functions is used than keep in mind the following order of operations you learned in math class:

Rule 1: First perform any calculations inside parentheses, if they exist.

Rule 2: Next perform all multiplications and divisions

Rule 3: Lastly, perform all additions and subtractions

The order of operation rules are demonstrated in the examples shown below:

(8 – 5) x 7 = 21 (Equa-21)

8 x 12 ÷ 6 = 16 (Equa-16)

6 x 3 + 5 = 23 (Equa-23)

11 + 12 ÷ 4 = 14 (Equa-14)

Each Arithmo puzzle employs the basic rules, but it will also have its own set of specific rules. Please read all the rules carefully for maximum benefit and enjoyment.