42.15 - 18.32 + 3.42
=630 - 576 + 126
=54 + 126 = 180
125.98 - 125.46 - 52.25
= 12250 - 5750 - 1300
= 6500 - 1300 = 5200
79.35 + 79.77 + 21.83 +21.29
=2765 + 6083 +1743 + 609
=11200
36.28 + 36.82 +64.69 +64.41
=1008 + 2952 + 4416 + 2624
=11000
43.63 - 43.20 + 57.88 - 45.57
= 2709 - 860 +5016 - 2565
=4300