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

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ГДЗ учебник по математике 2 класс Моро. Часть 2. Страница 22. Номер №16

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}

ГДЗ Математика 2 класс Моро, Бантова, Бельтюкова, Волкова, Степанова, 2014