Сторінки 41 - 60 » Стр.53 (7)

56 – 28 = 56 – 20 – 8 = 36 – 8 = 36 – 6 – 2 = 30 – 2 = 28 44 – 19 = 44 – 10 – 9 = 34 – 9 = 34 – 4 – 5 = 30 – 5 = 25 62 – 26 = 62 – 20 – 6 = 42 – 6 = 42 – 2 – 4 = 40 – 4 = 36 73 – 45 = 73 – 40 – 5 = 33 – 5 = 33 – 3 – 2 = 30 – 2 = 28 36 – 27 = 36 – 20 – 7 = 16 – 7 = 16 – 6 – 1 = 10 – 1 = 9 89 – 68 = 89 – 60 – 8 = 29 – 8 = 21 65 – (34 + 19) = 65 – (30 + 10 + 4 + 9) = 65 – (40 + 13) = 65 – 53 = 60 – 50 + 5 – 3 = 10 + 2 = 12 65 – 34 – 19 = 60 – 30 + 5 – 4 – 19 = 30 + 1 – 19 = 31 – 19 = 31 – 10 – 9 = 21 – 9 = 21 – 1 – 8 = 20 – 8 = 12