(860+40)-(560-60 ):100  = 4

1) 860+40 = 900

2) 560-60 = 500

3) 500:100 = 5

4) 900-5 = 895

(920-50)+(480+24):6 = 954

1) 920-50 = 870

2) 480+24 = 504

3) 504:6 = 84

4) 870+84 = 954

2400-(270+30)* (400-396) = 1200

1) 270+30 = 300

2) 400-396 = 4

3) 300*4 = 1200

4) 2400-1200 = 1200

510*6 = 3060

(78-20)+(230+470) = 758

1) 78-20 = 58

2) 230+470 = 700

3) 700+58 = 758