The Components of the Expression

Oct 13, 2025 by windailys.com 46 views

Introduction

In mathematics, expressions are a fundamental concept that helps us represent and solve problems. In this article, we will focus on calculating the expression $225 \times 10^{-2}$ . This expression involves multiplication and exponentiation, which are essential operations in mathematics. We will break down the expression, analyze its components, and provide a step-by-step solution to calculate its value.

The Components of the Expression

The given expression is $225 \times 10^{-2}$ . Let's break it down into its components:

225: This is a whole number, also known as an integer.
10: This is a base number, which is raised to a power.
-2: This is the exponent, which indicates the power to which the base number is raised.

Understanding Exponents

Exponents are a shorthand way of representing repeated multiplication. In this expression, the exponent -2 indicates that the base number 10 is raised to the power of -2. This means that 10 is multiplied by itself -2 times.

Calculating the Expression

To calculate the expression $225 \times 10^{-2}$ , we need to follow the order of operations (PEMDAS):

Parentheses: There are no parentheses in this expression.
Exponents: We need to evaluate the exponent -2. This means that 10 is multiplied by itself -2 times.
Multiplication: We need to multiply 225 by the result of the exponentiation.

Step-by-Step Solution

Let's break down the solution into smaller steps:

Step 1: Evaluate the Exponent

To evaluate the exponent -2, we need to multiply 10 by itself -2 times. This can be represented as:

10 × 10 × 10^2

However, since the exponent is negative, we need to take the reciprocal of 10 and raise it to the power of 2:

(1/10)^2

Step 2: Simplify the Exponent

To simplify the exponent, we can evaluate the expression (1/10)^2:

(1/10)^2 = 1/100

Step 3: Multiply 225 by the Result

Now that we have the result of the exponentiation, we can multiply 225 by 1/100:

225 × 1/100 = 2.25

Conclusion

In this article, we calculated the expression $225 \times 10^{-2}$ using the order of operations (PEMDAS). We broke down the expression into its components, evaluated the exponent, and simplified the result. Finally, we multiplied 225 by the result of the exponentiation to obtain the final answer.

Key Takeaways

Exponents are a shorthand way of representing repeated multiplication.
The order of operations (PEMDAS) is essential for evaluating mathematical expressions.
To calculate an expression with an exponent, we need to evaluate the exponent first and then multiply the result by the other numbers in the expression.

Real-World Applications

Understanding exponents and the order of operations is essential in various real-world applications, such as:

Science: Exponents are used to represent the power of a number in scientific notation.
Engineering: Exponents are used to represent the power of a number in engineering calculations.
Finance: Exponents are used to represent the power of a number in financial calculations.

Final Thoughts

$In conclusion, calculating the expression $225 \times 10^{-2}$ requires a thorough understanding of exponents and the order of operations. By following the steps outlined in this article, we can evaluate the expression and obtain the final answer.<br/> **Frequently Asked Questions: Calculating Expressions with Exponents**$

Introduction

In our previous article, we calculated the expression $225 \times 10^{-2}$ using the order of operations (PEMDAS). In this article, we will address some frequently asked questions related to calculating expressions with exponents.

Q&A

Q: What is the order of operations (PEMDAS)?

A: The order of operations (PEMDAS) is a set of rules that tells us which operations to perform first when evaluating an expression. The acronym PEMDAS stands for:

P: Parentheses
E: Exponents
M: Multiplication
D: Division
A: Addition
S: Subtraction

Q: How do I evaluate an exponent?

A: To evaluate an exponent, you need to multiply the base number by itself the number of times indicated by the exponent. For example, to evaluate the expression $2^3$ , you would multiply 2 by itself 3 times:

2 × 2 × 2 = 8

Q: What is the difference between a positive and negative exponent?

A: A positive exponent indicates that the base number is raised to a power, while a negative exponent indicates that the reciprocal of the base number is raised to a power. For example, to evaluate the expression $2^3$ , you would multiply 2 by itself 3 times:

2 × 2 × 2 = 8

However, to evaluate the expression $2^{-3}$ , you would take the reciprocal of 2 and raise it to the power of 3:

(1/2)^3 = 1/8

Q: How do I simplify an expression with an exponent?

A: To simplify an expression with an exponent, you need to evaluate the exponent first and then simplify the result. For example, to simplify the expression $2^3 \times 3^2$ , you would first evaluate the exponents:

2^3 = 8 3^2 = 9

Then, you would multiply the results:

8 × 9 = 72

Q: What is the rule for multiplying numbers with exponents?

A: When multiplying numbers with exponents, you need to add the exponents. For example, to evaluate the expression $2^3 \times 2^2$ , you would add the exponents:

2^3 = 8 2^2 = 4

Then, you would multiply the results:

8 × 4 = 32

Q: What is the rule for dividing numbers with exponents?

A: When dividing numbers with exponents, you need to subtract the exponents. For example, to evaluate the expression $2^3 \div 2^2$ , you would subtract the exponents:

2^3 = 8 2^2 = 4

Then, you would divide the results:

8 ÷ 4 = 2

Q: How do I evaluate an expression with multiple exponents?

A: To evaluate an expression with multiple exponents, you need to follow the order of operations (PEMDAS). First, you need to evaluate the exponents, and then you need to multiply or divide the results. For example, to evaluate the expression $2^3 \times 3^2 \div 4^2$ , you would first evaluate the exponents:

2^3 = 8 3^2 = 9 4^2 = 16

Then, you would multiply and divide the results:

8 × 9 = 72 72 ÷ 16 = 4.5

Conclusion

In this article, we addressed some frequently asked questions related to calculating expressions with exponents. We covered topics such as the order of operations (PEMDAS), evaluating exponents, simplifying expressions, and multiplying and dividing numbers with exponents. By following the rules outlined in this article, you can evaluate expressions with exponents and obtain the correct results.

Key Takeaways

The order of operations (PEMDAS) is essential for evaluating expressions with exponents.
Exponents indicate the power to which a number is raised.
When multiplying numbers with exponents, you need to add the exponents.
When dividing numbers with exponents, you need to subtract the exponents.

Real-World Applications

Understanding exponents and the order of operations is essential in various real-world applications, such as:

Science: Exponents are used to represent the power of a number in scientific notation.
Engineering: Exponents are used to represent the power of a number in engineering calculations.
Finance: Exponents are used to represent the power of a number in financial calculations.

Final Thoughts

In conclusion, calculating expressions with exponents requires a thorough understanding of the order of operations (PEMDAS) and the rules for evaluating exponents. By following the steps outlined in this article, you can evaluate expressions with exponents and obtain the correct results.