Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
1.1 Notes: Adding and Subtracting Integers There are three rules to help us combine numbers. Positive + Positive = Add the numbers and keep the sign of the larger number. Negative + Negative = Add the numbers and keep the sign of the larger number. Positive + Negative = Find the difference and keep the (or Neg + Pos) sign of the larger number. We need to remember these rules. Let’s try a few example… 1. 15 + 17 2. -12 + (-10) 3. 7 + (-12) 4. -4 + 7 5. 4 – 20 + 6 6. -3 – 11 + (-6) Another situation that will come up is when you subtract a negative number. It is important to remember to convert that into addition. 10 – (-5) 10 + 5 (the two negative signs = addition) 15 Let’s try a few examples….. 7. -3 – (-4) 8. 5 – (-12) 9. -20 – (-30) + 10 10. -6 – (-5) + 4 11. 3 – (-10) -6 12. -10 – (-6) – 3 (Stop and wait for teacher.) POS POS = POS NEG NEG = POS POS NEG = NEG POS NEG POS POS = POS NEG = POS NEG = NEG 1. 4(3) 2. (-5)(10) 3. (-10)(-5) 4. (7)(-4) 5. (8)(8) 6. (-11)(-4) 7. 10. 20 4 16 2 13. (-2)(-3)(5) 15. (6)(2)(2) 4 8. 11. 36 6 9. 25 5 10 40 12. 14. (6)(-2)(4) 16. 2 (4)(3)(1) 49 7