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# Crossmath

**Cross that math when you come to it.**

## Object of the Game

To insert the set of given numbers into the empty squares so when they are calculated in adjacent threes they equal the demands in the shaded boxes.

## How to Play

## Example

Insert numbers 1, 3, 5, 5, 6, 10, 11 and 12 into this CM11 puzzle grid which is prefilled with three numbers (8, 9 and 12) so all horizontal and vertical calculations are correct and satisfy the demands in the shaded squares. The solution is as follows:

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- Choose a prefilled number grid.
- Equa demands are prefilled in the shaded boxes.
- Insert the numbers from the given set into the empty squares and perform the math operation required to meet the Equa demands for both the row and column.
- 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*

- CrossMath is the only Arithmo game with predefined operations between the numbers to help you solve the puzzle.
- In some large size grids of CrossMath, you will have Equas on both the left and ride side of the puzzle to solve.
- Some grids may have squares prefilled with numbers depending on the difficulty level.
- For this game, adjacent numbers are three numbers connected
**vertically or horizontally**, as shown in the diagrams below.

Find which Equas, from 13 to 24, are missing on the grid.

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.