Решебник по математике 5 класс Алышева Нумерация и арифметические действия в пределах 100 Задание 27

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\[1)\ 34 + 12 = 34 + 10 + 2 =\]

\[= 44 + 2 = 46\]

\[21 + 32 = 21 + 30 + 2 =\]

\[= 51 + 2 = 53\]

\[52 + 16 = 52 + 10 + 6 =\]

\[= 62 + 6 = 68\]

\[25 + 41 = 25 + 40 + 1 =\]

\[= 65 + 1 = 66\]

\[32 + 15 = 32 + 10 + 5 =\]

\[= 42 + 5 = 47\]

\[16 + 23 = 16 + 20 + 3 =\]

\[= 36 + 3 = 39\]

\[42 + 42 = 42 + 40 + 2 =\]

\[= 82 + 2 = 84\]

\[75 + 13 = 75 + 10 + 3 =\]

\[= 85 + 3 = 88\]

\[38 + 41 = 38 + 40 + 1 =\]

\[= 78 + 1 = 79\]

\[64 + 35 = 64 + 30 + 5 =\]

\[= 94 + 5 = 99\]

\[2)\ 34 - 13 = 34 - 10 - 3 =\]

\[= 24 - 3 = 21\]

\[52 - 21 = 52 - 20 - 1 =\]

\[= 32 - 1 = 31\]

\[65 - 42 = 65 - 40 - 2 =\]

\[= 25 - 2 = 23\]

\[47 - 24 = 47 - 20 - 4 =\]

\[= 27 - 4 = 23\]

\[59 - 35 = 59 - 30 - 5 =\]

\[= 29 - 5 = 24\]

\[76 - 45 = 76 - 40 - 5 =\]

\[= 36 - 5 = 31\]

\[95 - 44 = 95 - 40 - 4 =\]

\[= 55 - 4 = 51\]

\[39 - 37 = 39 - 30 - 7 =\]

\[= 9 - 7 = 2\]

\[58 - 53 = 58 - 50 - 3 =\]

\[= 8 - 3 = 5\]

\[89 - 86 = 89 - 80 - 6 =\]

\[= 9 - 6 = 3\]