#### Introduction:

### Equation:

First, find the equation of an array and add them row-wise or column-wise**.**

**Example:**

Write the equation for the given array.

**Solution:**

Here, there are 2 rows and 3 columns.

So, the row-wise equation of the image is 3 + 3 = 6.

There are 6 pumpkins present in the image.

### Drawing:

Draw the image of the array and solve the problem.

**Example:**

Rachel ate 3 slices of pizza each day. Write how many slices of pizza she ate at the end of 3^{rd} day. Draw the array and find the answer.

**Solution:**

She ate 3 slices of pizza on day 1.

On the 2^{nd} day, she ate 3 slices of pizza.

On the 3^{rd} day, she ate 3 slices of pizza.

So, at the end of the 3rd day, she ate 3 + 3 + 3 = 9 slices of pizza.

Therefore, Rachel ate 9 slices of pizza in total.

**Example:**

Hal arranged the leaves into 3 rows and 3 columns. How many leaves does Hal have in all?

**Solution:**

Here, there are 3 rows and 3 columns.

So, the equation of the image is 3 + 3 + 3 = 9.

There are 9 leaves present in the image.

**Example:**

Mindy draws 5 rows of stars in her notebook. In each row, she placed 5 columns of stars. So, how many stars does she draw?

**Solution:**

Here, there are 5 rows and 5 columns.

So, the equation of the image is 5 + 5 + 5 + 5 + 5 = 25.

There are 25 stars present in the image.

**Example:**

Nill has a collection of sunglasses. He placed those in 3 rows and 3 columns. So, how many sunglasses does he have in total?

**Solution:**

Here, there are 3 rows and 3 columns.

So, the equation of the image is 3 + 3 + 3 = 9.

There are 9 sunglasses present in the image.

#### Exercise

- 2 rows of apples. 3 apples in each row. How many apples?
- 2 rows of cars. 4 cars per row. How many cars?
- Write two equations which explain the array.

4. Write the equation by rows for the array.

5. Write the equation by columns for the array.

6. Jolene puts cakes out on the table. She puts 3 rows of cakes with 4 in each row on the table. How many cakes does she have in all?

7. Write two equations that explains the array.

8. Write the equation by columns for the array.

9. Write two equations which explains the array.

10. Larry puts cupcakes on a plate. He puts 2 rows of cupcakes with 5 in each row. How many cupcakes does Larry have in all?

#### Related topics

#### Addition and Multiplication Using Counters & Bar-Diagrams

Introduction: We can find the solution to the word problem by solving it. Here, in this topic, we can use 3 methods to find the solution. 1. Add using counters 2. Use factors to get the product 3. Write equations to find the unknown. Addition Equation: 8+8+8 =? Multiplication equation: 3×8=? Example 1: Andrew has […]

Read More >>#### Dilation: Definitions, Characteristics, and Similarities

Understanding Dilation A dilation is a transformation that produces an image that is of the same shape and different sizes. Dilation that creates a larger image is called enlargement. Describing Dilation Dilation of Scale Factor 2 The following figure undergoes a dilation with a scale factor of 2 giving an image A’ (2, 4), B’ […]

Read More >>#### How to Write and Interpret Numerical Expressions?

Write numerical expressions What is the Meaning of Numerical Expression? A numerical expression is a combination of numbers and integers using basic operations such as addition, subtraction, multiplication, or division. The word PEMDAS stands for: P → Parentheses E → Exponents M → Multiplication D → Division A → Addition S → Subtraction Some examples […]

Read More >>#### System of Linear Inequalities and Equations

Introduction: Systems of Linear Inequalities: A system of linear inequalities is a set of two or more linear inequalities in the same variables. The following example illustrates this, y < x + 2…………..Inequality 1 y ≥ 2x − 1…………Inequality 2 Solution of a System of Linear Inequalities: A solution of a system of linear inequalities […]

Read More >>
Comments: