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Adding and Subtracting Positive and Negative Numbers Addition • • • • Negative + Negative = a “greater” negative Add the numbers Include a “-” sign Examples: -6 + -4 = -10 -2 + -2 = -4 • Practice -3 + -8 = -12 +-10 = Addition Continued • Positive + Positive = a greater positive number – Duh!! You’ve known this forever • Example: 2+2=4 • Let’s move on! Addition Continued • Positive + Negative (or Negative + Positive) • Follow these rules: – Find the difference of the two numbers – Use the larger number’s sign • Example: -23+4 = Find the difference: 23 – 4 = 19 Larger number’s sign is negative So, -23+4 = -19 • Practice: 49 + (-23)= -94 +87 = Subtraction • Change the problem to an addition problem • Keep the first number the same, change the second number to its opposite (OPP) • Then follow the rules of addition: – Find the difference of the two numbers – Use the larger number’s sign • Example: 32-68 = change to 32 + (-68) = 32 + (-68) = Find the difference: 68-32 = 36 Use larger number’s sign = -36 Subtraction Continued • Your turn. Complete these problems. Show your work!! 23 – 49 = -25 – 35 = 22 - 45 =