360+240= 620-140= 350+460= 800-130= 800-60= 840-10= 680+250= 540-380= 706+140=

Вычислим значения выражений:

• 360 + 240 =  300 + 60 + 200 + 40 = (300 + 200) + (60 + 40) = 500 + 100 = 600;
• 620 - 140 =  600 + 20 - 100 - 40 = (600 - 100) + (20 - 40) = 500 - 20 = 480;
• 350 + 460 = 300 + 400 + 50 + 60 = 700 + 110 = 810; 
• 800 - 130 = 800 - 100 - 30 = 700 - 30 = 670; 
• 800 - 60 = 700 + 100 - 60 = 700 + 40 = 740; 
• 840 - 10 = 800 + 40 - 10 = 800 + 30 = 830; 
• 680 + 250 = 600 + 200 + 80 + 50 = 800 + 130 = 930; 
• 540 - 380 = 500 + 40 - 300 - 80 = (500 - 300) + (40 - 80) = 200 - 40 = 160; 
• 706 + 140 = 700 + 6 + 100 + 40 = 800 + 46 = 846.