Вправи 502 - 600 » 518
10 + 5 = 15 30 + 7 = 37 50 + 1 = 51 90 + 9 = 99 100 + 5 = 105 300 + 7 = 307 500 + 1 = 501 900 + 9 = 909
10 + 5 = 15 30 + 7 = 37 50 + 1 = 51 90 + 9 = 99 100 + 5 = 105 300 + 7 = 307 500 + 1 = 501 900 + 9 = 909