⏱ PEMDAS e a Ordem das Operações numa Expressão Numérica 👉 Minuto Matemática

Summary

This video explains how to solve numerical expressions by emphasizing the importance of the order of operations. The script introduces the acronym 'PEMDAS' to help viewers remember the order: Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right). The video walks through a step-by-step example, showing how to simplify an expression by first solving parentheses, then following the correct order for multiplication, division, and addition. The message assures viewers that with practice, math success is guaranteed, and encourages continued learning.

Takeaways

• 😀 The order of operations is crucial when solving mathematical expressions.
• 😀 PEMDAS is a helpful mnemonic to remember the sequence of operations: Parentheses, Exponents, Multiplication/Division, Addition/Subtraction.
• 😀 Parentheses should always be resolved first in any mathematical expression.
• 😀 Exponents (powers) should be solved immediately after parentheses.
• 😀 Multiplication and Division have the same level of priority and should be solved from left to right.
• 😀 Addition and Subtraction also have the same level of priority, and they are solved from left to right after multiplication and division.
• 😀 In the example, 18 / 2 * 3^2 is solved by first calculating the exponent (3^2 = 9).
• 😀 After calculating the exponent, division is performed first (18 / 2 = 9), followed by multiplication (9 * 9 = 81).
• 😀 The final result of the expression 18 / 2 * 3^2 is 81.
• 😀 The speaker reassures the audience that with the right approach and practice, mathematical success is achievable.

Q & A

What is the main difficulty people face when solving numerical expressions?

The main difficulty people face is understanding the order of operations in numerical expressions.

What does the acronym 'PEDMAS' represent in the context of solving expressions?

PEDMAS stands for Parentheses, Exponents, Multiplication and Division, Addition and Subtraction. It outlines the correct order in which operations should be performed.

Why is it important to follow the correct order of operations?

Following the correct order ensures that mathematical expressions are solved consistently and correctly, avoiding confusion or errors.

What does 'P' in PEDMAS refer to, and why is it important?

'P' refers to Parentheses. It's important because operations inside parentheses are performed first, before any other operations in the expression.

How are exponents handled in PEDMAS?

Exponents are handled after parentheses and before multiplication, division, addition, and subtraction. They come next in the order of operations.

What is the relationship between multiplication and division in the order of operations?

Multiplication and division are treated equally in the order of operations. They are performed from left to right, depending on which comes first in the expression.

How are addition and subtraction handled in PEDMAS?

Addition and subtraction are performed last, and they are treated with equal priority. Like multiplication and division, they are carried out from left to right.

What is the first operation to be solved in the example provided in the script?

The first operation to be solved is the division inside the parentheses (18 / 2), as parentheses take the highest priority.

What happens when there is no operator between numbers inside parentheses, such as 18 / 2 in the example?

When no operator is explicitly stated between numbers inside parentheses, multiplication is assumed, and the operation is performed accordingly.

How does the final result of the example in the script arrive at 299?

The final result of 299 is reached by solving the expression step-by-step, following the order of operations. The calculation involves resolving the division, exponentiation, multiplication, and the final addition/subtraction as per the rules of PEDMAS.