 Site Navigation                            Algebra I Recipe: Addition and Subtraction of Real Numbers A. Adding Real Numbers with Like Signs
2. Answer will have the like sign.
3. "Slang" – add the numbers, keep the sign.   Examples:   -13 + -12   23 + 14   -7 + -6   8 + 13 B. Adding Real Numbers with Unlike Signs
1. Subtract the smaller absolute value from the larger one.
2. Answer will have the same sign as the larger number.
3. "Slang" – find the difference between the numbers and take the sign of the larger number for the answer.   Examples:   17 + (-4)   –23 + 18   –11 + 9   8 + -3 C. Subtracting Real Numbers
2. Change the number being subtracted to its opposite.
3. Go back to the addition steps.
4. "Slang" – add the opposite
5. x - y is the same as x + (-y) AND x + (-y) is the same as x - y.   Examples:   -4 - 7   12 - 19   (-1/3) - (4/5)   13 -(-6)   8 -(-6) - 7 + 14   -6 + (-15) + 9 -(-21)

G Redden

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