Розділ 4. Нумерація багатоцифрових чисел » 501

5000 + 2000 = 7000 6000 + 3000 = 9000 7000 – 2000 = 5000 8000 – 4000 = 4000 720 : 6 + 26 ● 13 – 450 : 3 = 120 + 338 – 150 = 308 31 ● 31 – 816 : 4 – 757 ● 1 = 961 – 204 – 757 = 757 – 757 = 0 (9 ● 50 + 5 ● 90) : 10 – (80 ● 4 : 32) + 120 ● 1 = (450 + 450) : 10 – (320 : 32) + 120 = 900 : 10 – 10 + 120 = 90 – 10 + 120 = 200 800 : 4 : 20 + 1 ● (35 ● 4 – 50) – 0 : 374 = 40 : 4 + (140 – 50) – 0 = 10 + 90 = 100