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 #14 : Solve Multi Step Problems With Positive And Negative Rational Numbers: Ccss.Math.Content.7.Ee.B.3

If a server at a restaurant gets a  tip on a bill of , then what will be the amount of the tip? 

 

Possible Answers:

Correct answer:

Explanation:

The first step to solving this problem is determining what operation we are going to use.

Think:we know that the tip is going to be  of .  The keyword "of" gives us a clue and indicates that we are going to multiply. 

As we have learned in previous lessons, we need to convert our percentage into a decimal before we are able to multiply:

Next, we can perform the multiplication operation and find the tip:

The server's tip will be 

Example Question #51 : Expressions & Equations

If a server at a restaurant gets a  tip on a bill of , then what will be the amount of the tip? 

Possible Answers:

Correct answer:

Explanation:

The first step to solving this problem is determining what operation we are going to use.

We know that the tip is going to be  of .  The keyword "of" gives us a clue and indicates that we are going to multiply. 

As we have learned in previous lessons, we need to convert our percentage into a decimal before we are able to multiply:

Next, we can perform the multiplication operation and find the tip:

The server's tip will be 

 

Example Question #52 : Expressions & Equations

If a server at a restaurant gets a  tip on a bill of , then what will be the amount of the tip? 

 

Possible Answers:

Correct answer:

Explanation:

The first step to solving this problem is determining what operation we are going to use.

We know that the tip is going to be  of .  The keyword "of" gives us a clue and indicates that we are going to multiply. 

As we have learned in previous lessons, we need to convert our percentage into a decimal before we are able to multiply:

Next, we can perform the multiplication operation and find the tip:

The server's tip will be 

Example Question #17 : Solve Multi Step Problems With Positive And Negative Rational Numbers: Ccss.Math.Content.7.Ee.B.3

If a server at a restaurant gets a  tip on a bill of , then what will be the amount of the tip? 

 

Possible Answers:

Correct answer:

Explanation:

The first step to solving this problem is determining what operation we are going to use.

Think:we know that the tip is going to be  of .  The keyword "of" gives us a clue and indicates that we are going to multiply. 

As we have learned in previous lessons, we need to convert our percentage into a decimal before we are able to multiply:

Next, we can perform the multiplication operation and find the tip:

The server's tip will be 

Example Question #13 : Algebra

Let  be the temperature expressed in degrees Celsius. Then the equivalent temperature  in degrees Fahrenheit can be calculated using the formula:

What is  expressed in degrees Fahrenheit?

Possible Answers:

Correct answer:

Explanation:

Example Question #14 : Algebra

Let be the temperature expressed in degrees Fahrenheit. Then the equivalent temperature  in degrees Celsius can be calculated using the formula:

What is  expressed in degrees Celsius (to the nearest degree)?

Possible Answers:

Correct answer:

Explanation:

, which rounds to 

Example Question #15 : Algebra

On average, 1 in 50 apples that grow in an orchard will not be harvested. Of those, half will rot on the ground. If 500 apples are growing in an orchard, how many will rot on the ground?

Possible Answers:

Correct answer:

Explanation:

If there are 500 apples and 1 in 50 will remain unharvested, then we can find the number of unharvested apples by multiplying. 

10 apples will remain unharvested. Of those, half will rot on the ground. Multiply to find how many apples rot on the ground.

5 apples will rot on the ground.

Example Question #2 : Word Problems

Erin is making thirty shirts for her upcoming family reunion. At the reunion she is selling each shirt for $18 apiece. If each shirt cost her $10 apiece to make, how much profit does she make if she only sells 25 shirts at the reunion?

Possible Answers:

Correct answer:

Explanation:

This problem involves two seperate multiplication problems. Erin will make $450 at the reunion but supplies cost her $300 to make the shirts. So her profit is $150.

Example Question #1 : Word Problems

Write as an equation: 

"Ten added to the product of a number and three is equal to twice the number."

Possible Answers:

Correct answer:

Explanation:

Let  represent the unknown quantity.

The first expression:

"The product of a number and three" is three times this number, or 

"Ten added to the product" is

The second expression:

"Twice the number" is two times the number, or

.

The desired equation is therefore

.

Example Question #2 : Word Problems

Write as an equation: 

Five-sevenths of the difference of a number and nine is equal to forty.

Possible Answers:

Correct answer:

Explanation:

"The difference of a number and nine" is the result of a subtraction of the two, so we write this as

"Five-sevenths of" this difference is the product of  and this, or

This is equal to forty, so write the equation as

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