# How to define numerical expressions?

- Author: Noreen Niazi
- Last Updated on: January 17, 2024

SECTIONS

ToggleNumerical expressions are an essential component of mathematical linguistics as they provide a clear and accurate representation of mathematics in terms, ideas. We will then explore the meaning of numerical expressions, defining them, describing their parts and uses in this article. Furthermore, we’ll illuminate the most important differences between numeric and algebra expressions with ten solved examples to strengthen your knowledge.

## Numerical Expressions: A Deeper Dive

**Definition:**

A numerical expression is a mathematical phrase that contains only numbers and operations but does not have variables. It stands for a specific amount or number and could be reduced to one numerical figure.**Components:****Numbers:** They are integral parts of numerical expressions and may come in integers, fractions, decimals or any combination thereof.**Operations:** The usual operations include addition, subtraction, multiplication, division and raising to a power.**Parentheses:** It was used to determine the sequence of operations, resulting in correct calculation.

## Numerical vs. Algebraic Expressions

**Numerical Expression:**

**Composition:** Consists of only numbers and mathematical operations.**Variables:** Absence of variables.**Examples:**

**Examples:**$5+2$, $3\times (4-1)$.

#### Algebraic Expression:

**Composition:**Involves numbers, variables, and arithmetic operations.**Variables:**Present, representing unknown or varying quantities.**Examples:**$2x+1$, $3{a}^{2}-2b$.

## Examples

#### Example 1: Addition

$3+7=10$

#### Example 2: Subtraction

$15-8=7$

#### Example 3: Multiplication

$4\times 6=24$

#### Example 4: Division

$20\xf75=4$

#### Example 5: Parentheses

$2\times (9-3)=12$

#### Example 6: Mixed Operations

$3+2\times 4=11$

#### Example 7: Fractions

$\frac{1}{2}+\frac{3}{4}=\frac{5}{4}$

#### Example 8: Decimals

$0.6\times 5=3$

#### Example 9: Exponentiation

${2}^{3}=8$

#### Example 10: Complex Numerical Expression

$4\times (7-2)+\frac{10}{2}=26$

## Word Problems

**Problem 1:**- If Sarah has 5 apples and gives 2 to her friend, then eats one, how many apples does she have left?
- Solution: $5-2-1=2$

- If Sarah has 5 apples and gives 2 to her friend, then eats one, how many apples does she have left?
**Problem 2:**- John earned $15 each day for a week. How much did he earn in total?
- Solution: $7\times 15=105$

- John earned $15 each day for a week. How much did he earn in total?
**Problem 3:**- A rectangular garden has a length of 12 meters and a width of 5 meters. What is the area of the garden?
- Solution: $12\times 5=60$

- A rectangular garden has a length of 12 meters and a width of 5 meters. What is the area of the garden?
**Problem 4:**- If a car travels at 60 miles per hour for 3 hours, how far does it go?
- Solution: $60\times 3=180$ miles

- If a car travels at 60 miles per hour for 3 hours, how far does it go?
**Problem 5:**- Amy spent half of her money on books and the rest on stationery. If she had $40, how much did she spend on stationery?
- Solution: $\frac{40}{2}=20$

- Amy spent half of her money on books and the rest on stationery. If she had $40, how much did she spend on stationery?

## Advantages

**Clarity:**It presents a clear and succinct depiction of mathematical operations.

**Precision:**Eliminates ambiguity, providing precise results.

**Simplicity:**It is suitable for simple computations without variables.

## Conclusion:

## FAQs

A1: Algebraic expressions are combinations of numbers and operations as well as variables representing unknown quantities.

A2: Yes, numerical expression could contain fractions and decimals since these are numbers that have been combined with operations.

A3: It also provides a means to ensure accuracy with regard to computation since the order of precedence is parenthesis followed by exponent, multiplication, division then addition and subtraction.

A4: No, rational expressions can be composite of elementary operations such as parentheses, fractions and decimals etc.

A5: Numerical expressions are critical components in different real-world settings ranging from finance, physics and engineering among others that involve precise computations.