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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hours 3
Real Numbers: Four Operations
In Hours 1 and 2, your math world expanded beyond the whole numbers to include positive and negative integers, real numbers, inequalities, and absolute value. Now, to use this knowledge, you learn the rules for adding, subtracting, multiplying, and dividing real numbers. These four operations with real numbers form an important foundation that allows you to set up and solve equations and advance to higher algebra skills.

Adding Real Numbers

Adding two whole numbers is probably one of the first math problems you learned to solve, right after you learned to count from 1 to 20. Because algebraic expressions include all the real numbers, not just whole numbers, you also need to be able to add real numbers. ...

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