Common Core: 7th Grade Math : Expressions & Equations

Study concepts, example questions & explanations for Common Core: 7th Grade Math

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Example Questions

Example Question #819 :Concepts

Simplify the following:

Possible Answers:

Correct answer:

Explanation:

When solving this problem we need to remember our order of operations, or PEMDAS.

PEMDAS stands for parentheses, exponents, multiplication/division, and addition/subtraction. When you have a problem with several different operations, you need to solve the problem in this order and you work from left to right for multiplication/division and addition/subtraction.

Parentheses: We are not able to add a variable to a number, so we move to the next step.

Multiplication: We can distribute (or multiply) the.

Addition/Subtraction: Remember, we can't add a variable to a number, so theis left alone.

Now we have

Example Question #820 :Concepts

Simplify:

Possible Answers:

Correct answer:

Explanation:

When solving this problem we need to remember our order of operations, or PEMDAS.

PEMDAS stands for parentheses, exponents, multiplication/division, and addition/subtraction. When you have a problem with several different operations, you need to solve the problem in this order and you work from left to right for multiplication/division and addition/subtraction.

Parentheses: We are not able to add a variable to a number, so we move to the next step.

Multiplication: We can distribute (or multiply) the.

Addition/Subtraction: Remember, we can't add a variable to a number, so theis left alone.

Example Question #42 :How To Subtract Variables

Simplify:

Possible Answers:

Correct answer:

Explanation:

When solving this problem we need to remember our order of operations, or PEMDAS.

PEMDAS stands for parentheses, exponents, multiplication/division, and addition/subtraction. When you have a problem with several different operations, you need to solve the problem in this order and you work from left to right for multiplication/division and addition/subtraction.

Parentheses: We are not able to add a variable to a number, so we move on to the next step

Multiplication: We can distribute the negative sign to theand

Remember, a negative times a negative will equal a positive, so we have a

Finally we can combine like terms

Example Question #11 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #12 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #13 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #14 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #15 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #16 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

Example Question #17 :Expressions & Equations

Which of the answer choices is equivalent to the following expression:

Possible Answers:

Correct answer:

Explanation:

In order to answer this question, we need to write the given expression is standard form.

First, we will need to use the distributive property, which tells us to multiply each component inside the parenthesis by the value outside the parenthesis. In this case we will multiply by theand theby the following fraction:

For the variable,

For the number,

Next, we put our products together:

This expression is considered to be simplified because we are not able to perform any other operations on its constituent components.

In other words, we can't add thetobecause the rules of operations tell us that these are unlike terms due to the presence of the variable,, in the enumerator and we cannot add unlike terms.

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