Pre-Algebra : Operations
Study concepts, example questions & explanations for Pre-Algebra
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Example Questions
Example Question #20 : Multiplication And Division
We have two negative numbers and one positive number. We multiply from left to right. Two negative numbers multiplied make a positive number. Two positive numbers multiplied is also positive.
Now the expression becomes,
Answer is 
Example Question #201 : Operations
We have three negative numbers and one positive number. We multiply from left to right. Two negative numbers multiplied makes a positie number. However, that positive number multiplied by a negative number is a negative number. The same applied when multipled with a positive number.
Now our expression becomes,
Finally the expression becomes,
Our answer is 
Example Question #21 : Multiplication And Division
The numbers are positive. We just divide.
Answer is 
Example Question #22 : Multiplication And Division
We have one positive and one negative number. When divided, our answer is negative.
The quotient is 
Example Question #23 : Multiplication And Division
We have two negative numbers. When divided, the answer is positive.
The quotient is 
Example Question #24 : Multiplication And Division
We have two positive numbers and one negative number. We work from left to right. When a positive number is divided by a negative number, the answer is a negative number. The same applied when divided by a positive number.
Now the expression becomes,
Answer is 
Example Question #26 : Multiplication And Division
When facing different operations, we will work from left to right since in PEMDAS, multiplication and division has no priority.
The product is 
The quotient is then 
Example Question #27 : Multiplication And Division
When facing different operations, we will work from left to right since in PEMDAS, multiplication and division has no priority. We have two negative numbers and one positive number. We will get a negative number when a positive number and negative number multiply.
That answer is
Then, when two negative numbers are divided, we get a positive number.
That answer is 
Example Question #202 : Operations
Fill in the blank.
When solving this problem, we must think "what times 7 will give us 28?" In this case,
When we don't know the value of something, we can replace it with a variable. So,
can be written as
Then, we solve for x. We divide both sides by 7.
Example Question #24 : Multiplication And Division
Solve:
Since we are multiplying with two positive numbers, our answer will be positive. Answer is 
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