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Review Chapter - Jan. 9th ● Adding or Subtracting reals #’s ○ Same sign: KEEP sign and COMBINE #’s ○ Different signs: take difference, use the larger value sign ● Multiplying and Dividing real #’s ○ Same sign: answer positive ○ Different sign: answer negative 1. -3 + 10 = 7 2. -11 + (15) = -26 3. 3 + (-9) = 12 4. -2/11 + 7/9 = 59/99 a. Find common denominator (11 x 9 = 99) b. Multiply 11 by 9 as well as -2 by 9 c. Multiply 9 by 11 as well as 7 by 11 That gives you -18/99 + 77/99 1. 3 x -9 = -27 2. (-5) x (-4) = 20 3. -1/4 x -2/9 = 2/36 , simplified: = 1/18 4. 4 / -2 = -2 5. -16/4 = -4 ● Keep Change Flip (K.F.C.) 6. -⅓ / ⅝ = -8/15 Change the problem to: -1/3 x 8/5 That gives you…. -8/15 7. -1/4 / -7/16 = Change the problem to: -1/4 x 16/-7 = -16/-28 / 4 = 4/7 ● Is the 0 is on top its O/K … if it’s on bottom its a N/O! 8. 0/7 = 0 (O/K) 9. -7/0 = undefined (N/O) ● Absolute Value: ○ Measures the distance of a number from 0! ○ (Always distance!) Let’s pretend the parenthesis are ABSOLUTE VALUE BARS!!!! 1. (- 12) = 12 2. (-3 - 5) -3-5 = (- 8 as your final answer 3. (-6) = 6-4 = 2