1) If + sign meet with + sign, it will change to  a) - b) + c) I don't know teacher 2) If + sign meet with - sign, it will change to  a) - b) + c) I still don't know the answer 3) If - sign meet with + sign, it will change to a) Is it the same question teacher? Hmm.. b) + c) - 4) If - sign meet with - sign, it will change to a) I think I don't know laa teacher b) - c) + 5) 90 + ( +50 ) a) 90 - 50 = 40 b) 90 + 50 = 140 6) 40 + ( - 35 ) a) 40 - 35 = 5 b) 40 + 35 = 75 7) -75 + ( + 74 ) a) - 75 - 74 = -149 b) - 75 + 74 = - 1 8) 80 - ( + 50 ) a) 80 - 50 = 30 b) 80 + 50 = 130 9) 50 - ( - 70 ) a) 50 + 70 = 120 b) 50 - 70 = - 20 10) - 31 + ( - 30 ) a) - 31 + 30 = -1 b) - 31 - 30 = - 61 11) - 20 x ( - 2 ) a) 40 b) - 40 12) 35 x ( - 2 ) a) 70 b) -70 13) - 3 x ( - 40 ) a) -120 b) 120 14) 45 ➗ ( - 5 ) a) - 9 b) 9 15) - 70 ➗ ( - 7 ) a) - 10 b) 10

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