Pre-Algebra : Addition and Subtraction
Study concepts, example questions & explanations for Pre-Algebra
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Example Questions
Example Question #144 : Operations And Properties
Just add the number normally. The answer is 
Example Question #145 : Operations And Properties
When a plus and minus sign meet, the sign becomes negative. Subtract normally. Answer is 
Example Question #151 : Operations And Properties
When a plus and minus sign meet, the sign becomes negative. Since 
Example Question #152 : Operations And Properties
When a plus and minus sign meet, the sign becomes negative. Since 
Example Question #153 : Operations And Properties
When a plus and minus sign meet, the sign becomes negative. Since 
Example Question #154 : Operations And Properties
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 And Properties
Just subtract normally. Answer is 
Example Question #156 : Operations And Properties
When two minus signs meet, the sign becomes positive. It becomes an addition problem. Answer is 
Example Question #157 : Operations And Properties
This is the same as adding two negative numbers. We treat as an addition problem and add the minus sign in the end. Answer is 
Example Question #158 : Operations And Properties
When two minus signs meet, the sign becomes positive. Since 
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