Pre-Algebra : Pre-Algebra

Study concepts, example questions & explanations for Pre-Algebra

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Example Questions

Example Question #15 : Addition And Subtraction

Add:  

Possible Answers:

Correct answer:

Explanation:

Simplify the parentheses.  

A positive and a negative sign will result in a negative sign.

When all numbers are negative that are being added, simply add the integers and then place the negative sign in front of the final answer.

Example Question #18 : Addition And Subtraction

Add .

Possible Answers:

Correct answer:

Explanation:

Add the ones digit.

Since this number is 10 or greater, we must carry over the tens digit to the next calculation.

Add the tens digit with the carry over.

There is no carry over.

Add the hundreds digits.  The hundreds digit for  is zero.

Combine all ones digits.

The answer is .

Example Question #141 : Operations

Possible Answers:

Correct answer:

Explanation:

Just add the number normally. The answer is .

Example Question #142 : Operations

Possible Answers:

Correct answer:

Explanation:

When a plus and minus sign meet, the sign becomes negative. Subtract normally. Answer is .

Example Question #151 : Operations

Possible Answers:

Correct answer:

Explanation:

When a plus and minus sign meet, the sign becomes negative. Since  is greater than   and is negative, our answer is negative. We treat as a subtraction problem. Answer is .

Example Question #152 : Operations

Possible Answers:

Correct answer:

Explanation:

When a plus and minus sign meet, the sign becomes negative. Since  is greater than   and is negative, our answer is negative. We treat as a subtraction problem. Answer is .

Example Question #153 : Operations

Possible Answers:

Correct answer:

Explanation:

When a plus and minus sign meet, the sign becomes negative. Since  is greater than   and is positive, our answer is positive. We treat as a subtraction problem. Answer is .

Example Question #154 : Operations

Possible Answers:

Correct answer:

Explanation:

When a plus and minus sign meet, the sign becomes negative. When adding two negative numbers, we treat as an addition problem and add a minus sign in the end. Answer is .

Example Question #155 : Operations

Possible Answers:

Correct answer:

Explanation:

Just subtract normally. Answer is .

Example Question #156 : Operations

Possible Answers:

Correct answer:

Explanation:

When two minus signs meet, the sign becomes positive. It becomes an addition problem. Answer is .

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