Page 257: Addition
1. Complete the additions:
- a. (+6) + (+4) = +10
- b. (-3) + (-2) = -5 (3 negatives and 2 negatives make 5 negatives)
- c. (+5) + (-7) = -2 (5 positives cancel 5 negatives, leaving 2 negatives)
- d. (-2) + (+6) = +4 (2 negatives cancel 2 positives, leaving 4 positives)
2. Cancel Zero Pairs:
- a. 3 Positives, 5 Negatives.
- 3 pairs cancel. Left with 2 Negatives.
- Result: -2
- b. 6 Positives, 3 Negatives.
- 3 pairs cancel. Left with 3 Positives.
- Result: +3
Page 258: Subtraction
1. Evaluate:
- a. (+10) - (+7) = +3
- b. (-8) - (-4) = -4 (Start with 8 neg, take away 4 neg)
- c. (-9) - (-4) = -5
- d. (+9) - (+12) = -3 (Need to add zero pairs to take away 12 pos from 9 pos)
- e. (-5) - (-7) = +2 (Need to add zero pairs to take away 7 neg from 5 neg)
- f. (-2) - (-6) = +4
2. Complete Subtractions:
- a. (-5) - (-7) = +2
- b. (+10) - (+13) = -3
- c. (-7) - (-9) = +2
- d. (+3) - (+8) = -5
- e. (-2) - (-7) = +5
- f. (+3) - (+15) = -12