ГДЗ рабочая тетрадь Математика 2 класс Минаева С С, Зяблова Л О, страница 9, 2017 (ответы)
Страница 9
Устный счет
Задание 1.
20 – 7 = (10 + 10) – 7 = 10 + (10 – 7) = 10 + 3 = 13
20 – 5 = (10 + 10) – 5 = 10 + (10 – 5) = 10 + 5 = 15
20 – 1 = (10 + 10) – 1 = 10 + (10 – 1) = 10 + 9 = 19
20 – 4 = (10 + 10) – 4 = 10 + (10 – 4) = 10 + 6 = 16
20 – 6 = (10 + 10) – 6 = 10 + (10 – 6) = 10 + 4 = 14
20 – 9 = (10 + 10) – 9 = 10 + (10 – 9) = 10 + 1 = 11
20 – 8 = (10 + 10) – 8 = 10 + (10 – 8) = 10 + 2 = 12
20 – 3 = (10 + 10) – 3 = 10 + (10 – 3) = 10 + 7 = 17

7 + 7 = 7 + (3 + 4) = (7 + 3) + 4 = 10 + 4 = 14
7 + 9 = 7 + (3 + 6) = (7 + 3) + 6 = 10 + 6 = 16

6 + 6 = (2 + 4) + 6 = 2 + (4 + 6) = 2 + 10 = 12
6 + 8 = (4 + 2) + 8 = 4 + (2 + 8) = 4 + 10 = 14
6 + 7 = (3 + 3) + 7 = 3 + (3 + 7) = 3 + 10 = 13

8 + 8 = 16
8 + 7 = (5 + 3) + 7 = 5 + (3 + 7) = 5 + 10 = 15
8 + 9 = (7 + 1) + 9 = 7 + (1 + 9) = 7 + 10 = 17

16 – 7 + 3 = 9 + 3 = 12
16 – 7 + 5 = 9 + 5 = 14
16 – 7 + 9 = 9 + 9 = 18

17 + 3 – 0 = 20
17 + 3 – 10 = 20 – 10 = 10
17 + 3 – 15 = 20 – 15 = 5

10 + 50 = 60
30 + 50 = 80
50 + 50 = 100

80 – 40 = 40
80 – 70 = 10
80 – 20 = 60

Задание 2.
2, 4, 6, …, …, 12, …, …., 18, …, …
4 – 2 = 2
Последующее число на 2 больше предыдущего числа.
2 + 2 = 4
4 + 2 = 6
6 + 2 = 8
8 + 2 = 10
10 + 2 = 12
12 + 2 = 14
14 + 2 = 16
16 + 2 = 18
18 + 2 = 20
20 + 2 = 22
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