1) 2.9 + (-7.4) = -4.52) -4.1 + 1.8 = -2.33) -2 1/3 + (-1 7/9) = -2 3/9 + (-1 7/9) = -3 10/9 = -3 1/34) -1 5/6 + (-3 5/12) = -1 5/6 + (-3 7/12) = -1 5/6 + (-3 7/12) = -4 19/12 = -5 7/125) -2 1/6 + (-0.9) + 3 1/15 = -2 1/6 - 9/10 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 54/10 + 45/10 = -2 53/106) -1 2/15 + 3 5/6 + (-1.7) = -1 2/15 + 3 5/6 - 1.7 = -1 2/15 + 3 5/6 - 1.7 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 16/30 + 22/30 - 17/10 = -1 44/30 + 66/30 - 51/30 = 1 9/30 = 1 3/10
1) 2.9 + (-7.4) = -4.5
2) -4.1 + 1.8 = -2.3
3) -2 1/3 + (-1 7/9) = -2 3/9 + (-1 7/9) = -3 10/9 = -3 1/3
4) -1 5/6 + (-3 5/12) = -1 5/6 + (-3 7/12) = -1 5/6 + (-3 7/12) = -4 19/12 = -5 7/12
5) -2 1/6 + (-0.9) + 3 1/15 = -2 1/6 - 9/10 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 1/6 - 54/60 + 3 1/15 = -2 54/10 + 45/10 = -2 53/10
6) -1 2/15 + 3 5/6 + (-1.7) = -1 2/15 + 3 5/6 - 1.7 = -1 2/15 + 3 5/6 - 1.7 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 2/15 + 3 5/6 - 1 7/10 = -1 16/30 + 22/30 - 17/10 = -1 44/30 + 66/30 - 51/30 = 1 9/30 = 1 3/10