Решебник по математике 4 класс Перова рабочая тетрадь Часть 1, 2 Часть 1 | Страница 34

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

\[24 + 6 = 30\]

\[30 - 24 = 6\]

\[30 - 6 = 24\]

\[48 + 7 = 55\]

\[55 - 7 = 48\]

\[55 - 48 = 7\]

\[80 - 35 = 45\]

\[40 + 15 = 55\]

\[19 + 17 = 36\]

\[100 - 77 = 23\]

\[60 - 19 = 41\]

\[70 - 46 = 24\]

\[\boxed{\mathbf{19.}}\]

\[1)\ 53 + 14 = 67\]

\[53 + 23 = 76\]

\[53 + 17 = 70\]

\[53 + 19 = 72\]

\[53 + 45 = 98\]

\[53 + 48 = 101\]

\[53 + 20 = 73\]

\[53 + 34 = 87\]

\[53 + 7 = 60\]

\[53 + 4 = 57\]

\[2)\ 45 - 30 = 15\]

\[45 - 23 = 22\]

\[45 - 9 = 36\]

\[45 - 18 = 27\]

\[45 - 37 = 8\]

\[45 - 45 = 0\]

\[45 - 26 = 19\]

\[45 - 8 = 37\]

\[45 - 38 = 7\]

\[45 - 15 = 30\]