Частина 2. Номер 285
Поясни способи додавання.
463 + 326 = (400 + 60 + 3) + (300 + 20 + 6) = (400 + 300) + (60 + 20) + (3 + 6) = 700 + 80 + 9 = 789;
436 + 122 = (400 + 30 + 6) + (100 + 20 + 2) = (400 + 100) + (30 + 20) + (6 + 2) = 500 + 50 + 8 = 558;
362 + 335 = (300 + 60 + 2) + (300 + 30 + 5) = (300 + 300) + (60 + 30) + (2 + 5) = 600 + 90 + 7 = 697.