Addition and Subtraction - Pre-Algebra

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.

Add the ones digits.

Add the tens digits.

Combine the two digits.

The answer is .

The ones digit cannot be subtracted as is. We cannot borrow a one from the tens digit. Borrow a one from the of both the tens and the hundreds digit of .

This is the ones digit of the final answer.

Because a one was borrowed, the tens digit of will be come a , and the hundreds digit will become zero. Subtract the tens digits.

The correct answer is . Adding 82 and 19 will give 101 as the answer.

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 .

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 .

Just add the number normally. The answer is .

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

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 .

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 .

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

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 .

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

Add the ones digits.

Add the tens digits.

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.

The answer is:

Add the ones digits.

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.

The answer is:

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 .

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

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

A plus and a minus sign becomes a minus sign. Then we just add the numbers and add the minus sign in the end. Answer is .

These are simply positive numbers. We subtract normally. Answer is .