Номер 367

• (400 + 20) + 500 = (400 + 500) + 20 = 900 + 20 = 920;

• (300 + 70) – 40 = 300 + (70 – 40) = 300 + 30 = 330;

• (500 + 40) + 50 =500 + (40 + 50) = 500 + 90 = 590;

• (600 + 30) – 400 = (600 – 400) + 30 = 200 + 30 = 230;

• 510 + 300 = (500 + 10) + 300 = (500 + 300) + 10 = 800 + 10 = 810;

• 890 – 700 = (800 + 90) – 700 = (800 – 700) + 90 = 100 + 90 = 190.