Решебник по математике 3 класс овз Алышева ФГОС Часть 1, 2 Часть 2. Сложение и вычитание двузначных чисел Задание 18

\[\boxed{\mathbf{18.}}\]

\[1)\ 28 - 18 = 28 - 10 - 8 =\]

\[= 18 - 8 = 10\]

\[31 - 21 = 31 - 20 - 1 =\]

\[= 11 - 1 = 10\]

\[47 - 37 = 47 - 30 - 7 =\]

\[= 17 - 7 = 10\]

\[53 - 33 = 53 - 30 - 3 =\]

\[= 23 - 3 = 20\]

\[46 - 26 = 46 - 20 - 6 =\]

\[= 26 - 6 = 20\]

\[61 - 31 = 61 - 30 - 1 =\]

\[= 31 - 1 = 30\]

\[75 - 45 = 75 - 40 - 5 =\]

\[= 35 - 5 = 30\]

\[82 - 32 = 82 - 30 - 2 =\]

\[= 52 - 2 = 50\]

\[94 - 24 = 94 - 20 - 4 =\]

\[= 74 - 4 = 70\]

\[2)\ 25 - 21 = 25 - 20 - 1 =\]

\[= 5 - 1 = 4\]

\[43 - 42 = 43 - 40 - 2 =\]

\[= 3 - 2 = 1\]

\[57 - 53 = 57 - 50 - 3 =\]

\[= 7 - 3 = 4\]

\[66 - 62 = 66 - 60 - 2 =\]

\[= 6 - 2 = 4\]

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

\[= 9 - 7 = 2\]

\[85 - 81 = 85 - 80 - 1 =\]

\[= 5 - 1 = 4\]

\[78 - 75 = 78 - 70 - 5 =\]

\[= 8 - 5 = 3\]

\[89 - 82 = 89 - 80 - 2 =\]

\[= 9 - 2 = 7\]

\[93 - 92 = 93 - 90 - 2 =\]

\[= 3 - 2 = 1\]