Ответы к учебнику по математике за 2 класс 2 часть Моро. Страница 22. Номер №16

42 + 18
24 + 36
59 + 18
32 + 49
99 − 61
66 − 55
63 − 44
98 − 17
17 + 71
23 + 32
43 + 38
74 + 26
98 − 73
89 − 37
53 − 42
88 − 83

42 + 18 = (40 + 10) + (2 + 8) = 50 + 10 = 60

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 42 \\ 18 \end{array} \\ \begin{array}{r} 60 \end{array} \end{array}

24 +
36 = (
20 +
30) + (
4 +
6) =
50 +
10 =
60

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 24 \\ 36 \end{array} \\ \begin{array}{r} 60 \end{array} \end{array}

59 +
18 = (
50 +
10) + (
9 +
8) =
60 + (
9 +
1 +
7) =
60 + (
10 +
7) =
60 +
10 +
7 =
70 +
7 =
77

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 59 \\ 18 \end{array} \\ \begin{array}{r} 77 \end{array} \end{array}

32 +
49 = (
30 +
40) + (
2 +
9) =
70 + (
1 +
1 +
9) =
70 + (
1 +
10) =
70 +
10 +
1 =
80 +
1 =
81

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 32 \\ 49 \end{array} \\ \begin{array}{r} 81 \end{array} \end{array}

99 −
61 = (
90 +
9) − (
60 +
1) = (
90 −
60) + (
9 −
1) =
30 +
8 =
38

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 99 \\ 61 \end{array} \\ \begin{array}{r} 38 \end{array} \end{array}

66 −
55 = (
60 +
6) − (
50 +
5) = (
60 −
50) + (
6 −
5) =
10 +
1 =
11

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 66 \\ 55 \end{array} \\ \begin{array}{r} 11 \end{array} \end{array}

63 −
44 = (
50 +
13) − (
40 +
4) = (
50 −
40) + (
13 −
4) =
10 +
9 =
19

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 63 \\ 44 \end{array} \\ \begin{array}{r} 19 \end{array} \end{array}

98 −
17 = (
90 +
8) − (
10 +
7) = (
90 −
10) + (
8 −
7) =
80 +
1 =
81

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 98 \\ 17 \end{array} \\ \begin{array}{r} 81 \end{array} \end{array}

17 +
71 = (
10 +
70) + (
7 +
1) =
80 +
8 =
88

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 17 \\ 71 \end{array} \\ \begin{array}{r} 88 \end{array} \end{array}

23 +
32 = (
20 +
30) + (
3 +
2) =
50 +
5 =
55

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 23 \\ 32 \end{array} \\ \begin{array}{r} 55 \end{array} \end{array}

43 +
38 = (
40 +
30) + (
3 +
8) =
70 +
11 =
70 +
10 +
1 =
80 +
1 =
81

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 43 \\ 38 \end{array} \\ \begin{array}{r} 81 \end{array} \end{array}

74 +
26 = (
70 +
20) + (
4 +
6) =
90 +
10 =
100

\begin{array}{r} \begin{array}{r} + \end{array} \begin{array}{r} 74 \\ 26 \end{array} \\ \begin{array}{r} 100 \end{array} \end{array}

98 −
73 = (
90 +
8) − (
70 +
3) = (
90 −
70) + (
8 −
3) =
20 +
5 =
25

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 98 \\ 73 \end{array} \\ \begin{array}{r} 25 \end{array} \end{array}

89 −
37 = (
80 +
9) − (
30 +
7) = (
80 −
30) + (
9 −
7) =
50 +
2 =
52

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 89 \\ 37 \end{array} \\ \begin{array}{r} 52 \end{array} \end{array}

53 −
42 = (
50 +
3) − (
40 +
2) = (
50 −
40) + (
3 −
2) =
10 +
1 =
11

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 53 \\ 42 \end{array} \\ \begin{array}{r} 11 \end{array} \end{array}

88 −
83 = (
80 +
8) − (
80 +
3) = (
80 −
80) + (
8 −
3) =
0 +
5 =
5

\begin{array}{r} \begin{array}{r} — \end{array} \begin{array}{r} 88 \\ 83 \end{array} \\ \begin{array}{r} 5 \end{array} \end{array}