Решебник по математике 5 класс Алышева Нумерация и арифметические действия в пределах 100 Задание 35

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\[1)\ 18 + 5 = 18 + 2 + 3 =\]

\[= 20 + 3 = 23\]

\[29 + 3 = 29 + 1 + 2 =\]

\[= 30 + 2 = 32\]

\[37 + 4 = 37 + 3 + 1 =\]

\[= 40 + 1 = 41\]

\[45 + 6 = 45 + 5 + 1 = 50 + 1 =\]

\[= 51\]

\[59 + 5 = 59 + 1 + 4 = 60 + 4 =\]

\[= 64\]

\[58 + 4 = 58 + 2 + 2 = 60 + 2 =\]

\[= 62\]

\[66 + 7 = 66 + 4 + 3 = 70 + 3 =\]

\[= 73\]

\[68 + 9 = 68 + 2 + 7 = 70 + 7 =\]

\[= 77\]

\[75 + 7 = 75 + 5 + 2 = 80 + 2 =\]

\[= 82\]

\[87 + 8 = 87 + 3 + 5 = 90 + 5 =\]

\[= 95\]

\[2)\ 24 - 5 = 24 - 4 - 1 =\]

\[= 20 - 1 = 19\]

\[31 - 4 = 31 - 1 - 3 = 30 - 3 =\]

\[= 27\]

\[42 - 3 = 42 - 2 - 1 = 40 - 1 =\]

\[= 39\]

\[71 - 3 = 71 - 1 - 2 = 70 - 2 =\]

\[= 68\]

\[45 - 6 = 45 - 5 - 1 = 40 - 1 =\]

\[= 39\]

\[56 - 8 = 56 - 6 - 2 = 50 - 2 =\]

\[= 48\]

\[62 - 7 = 62 - 2 - 5 = 60 - 5 =\]

\[= 55\]

\[86 - 9 = 86 - 6 - 3 = 80 - 3 =\]

\[= 77\]

\[94 - 8 = 94 - 4 - 4 = 90 - 4 =\]

\[= 86\]

\[93 - 5 = 93 - 3 - 2 = 90 - 2 =\]

\[= 88\]