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# Cross Inverse

**Cross over to the flip side**

## Object of the Game

To place all given Equas into the shaded result fields so when three adjacent numbers in the grid are calculated together they result in the placed Equas for both row and column.

## How to Play

## Example

Insert Equas 15, 16, 18 and 21 into the shaded boxes in this CM8 shape so all horizontal and vertical three numbers give that result when they are added, subtracted, multiplied, or divided together using the order of operations. The solution is as follows:

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- Choose a prefilled number grid.
- Calculate the prefilled numbers in adjacent threes.
- Numbers can be calculated in any combination, but keep in mind the mathematical order of operations as you calculate:
*First perform any calculations inside parentheses, if they exist.**Next perform all multiplications and divisions**Lastly, perform all additions and subtractions*

**For this game, adjacent numbers are three numbers connected horizontally or vertically only, as shown in the diagrams below.****No “L” shape is allowed.**

- Calculated numbers should satisfy the result for both row and column.
- In some larger grids of Cross Inverse, you will have empty result fields on both the left and ride side of the puzzle to solve.

Let’s check the solution:

3 x 9 – 6 = 21

11 + 11 – 4 = 18

4 * (9 – 5) = 16

11 + 7 – 3 = 15

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Основна правила Аритма:

**Да пронађете или убаците у мрежу три суседна броја која када се заједно израчунају резултирају Еквом-X.****Еква и Eква-X**су термини који једноставно значе решење једначине. На пример: 2 x 4 -1 = 7**(Еква-7)**- У Аритму, једначина се прави од 3 конектована броја на мрежи.
- Постоји 5 типова мрежа: 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.

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.