# Pre-Algebra : Addition and Subtraction

## Example Questions

### Example Question #31 : Addition And Subtraction

Explanation:

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

### Example Question #32 : Addition And Subtraction

Explanation:

When two minus signs meet, the sign becomes positive. We have two of the same numbers but with different signs. Answer is .

### Example Question #33 : Addition And Subtraction

Explanation:

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

There are no carry overs in this question.

Combine all the numbers for the final answer.

### Example Question #33 : Addition And Subtraction

Explanation:

Since this number is ten or greater, the tens digit is the carry over for the next calculation.

The zero is the ones digit of the final answer.

Add the tens digits with the carry over.

This value is also ten or greater, so the tens digit is the carryover.  The six is the tens digit of the final answer.

Add the hundreds digit with the carryover.  The hundreds digit for  is zero.

This is the hundreds digit of the final answer.  There are no carry overs.

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

This is the thousands digit of the final answer.  Combine all numbers.

### Example Question #34 : Addition And Subtraction

Solve:

Explanation:

The numbers are positive. Just add. The sum is .

### Example Question #35 : Addition And Subtraction

Solve:

Explanation:

A plus and minus sign becomes a minus sign. This is just a subtraction problem. Answer is .

### Example Question #37 : Addition And Subtraction

Solve:

Explanation:

A plus and minus sign becomes a minus sign. Since  is greater than  and is negative, our answer is negative. This is just a subtraction problem. Answer is .

### Example Question #36 : Addition And Subtraction

Solve:

Explanation:

Since  is greater than  and is negative, our answer is negative. This is just a subtraction problem. Answer is .

### Example Question #37 : Addition And Subtraction

Solve:

Explanation:

Since  is greater than  and is positive, our answer is positive. This is just a subtraction problem. Answer is .

Solve: