ГДЗ рабочая тетрадь Математика 2 класс Минаева С С, Зяблова Л О, страница 16, 2017 (ответы)
Страница 16.
Устный счет
Задание 1.
10 – (2 + 7) = 10 – 9 = 1
10 – (3 + 4) = 10 – 7 = 3
10 – (1 + 9) = 10 – 10 = 0

20 – (1 + 5) = 20 – 6 = (10 + 10) – 6 = 10 + (10 – 6) = 10 + 4 = 14
20 – (4 + 5) = 20 – 9 = (10 + 10) – 9 = 10 + (10 – 9) = 10 + 1 = 11
20 – (2 + 8) = 20 – 10 = 10

20 – (11 – 6) = 20 – 5 = 15
20 – (12 – 5) = 20 – 7 = 13
20 – (13 – 9) = 20 – 4 = 16

7 + (5 + 7) = (7 + 7) + 5 = 14 + 5 = 19
7 + (4 + 9) = (7 + 4) + 9 = 11 + 9 = 20
7 + (3 + 8) = (7 + 3) + 8 = 10 + 8 = 18

12 + 3 = 15
15 – 7 = 15 – (5 + 2) = (15 – 5) – 2 = 10 – 2 = 8
8 – 8 = 0

17 + 3 = (10 + 7) + 3 = 10 + (7 + 3) = 10 + 10 = 20
20 – 7 = (10 + 10) – 7 = 10 + (10 – 7) = 10 + 3 = 13
13 – 8 = 13 – (3 + 5) = (13 – 3) – 5 = 10 – 5 = 5
5 + 7 = 5 + (5 + 2) = (5 + 5) + 2 = 10 + 2 = 12
12 – 6 = 6

19 + 1 = 20
20 – 4 = (10 + 10) – 4 = 10 + (10 – 4) = 10 + 6 = 16
16 – 9 = (7 + 9) – 9 = 7 + (9 – 9) = 7
7 + 8 = 15
15 – 5 = 10

Задание 2.
11 – 6 = 5
6 – 1 = 5
5 – 1 = 4

11 – 8 = 3
3 – 2 = 1
8 – 2 = 6

11 – 4 = 7
4 – 3 = 1
7 – 3 = 4
1 – 1 = 0
3 – 1 = 2
4 – 2 = 2
0 – 0 = 0
1 – 0 = 1
2 – 1 = 1
2 – 1 = 1
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