Решебник по математике 5 класс Ерина Виленкин рабочая тетрадь Часть 1, 2 Часть 1 | Страница 10

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\[\boxed{\mathbf{9}.}\]

\[400 + 50 + 8 = 458\]

\[7000 + 800 + 70 + 9 = 7879\]

\[800 + 50 + 9 = 859\]

\[9000 + 700 + 10 + 5 = 9715\]

\[60\ 000 + 9000 + 400 + 30 + 9 =\]

\[69\ 439\]

\[500 + 8 = 508\]

\[3000 + 500 + 3 = 3503\]

\[90\ 000 + 5000 + 20 = 95\ 020\]

\[\boxed{\mathbf{10}.}\]

\[8199 \rightarrow 8200\]

\[203\ 400 \rightarrow 203\ 401\]

\[70\ 999 \rightarrow 71\ 000\]

\[3\ 654\ 057 \rightarrow 3\ 654\ 058\]

\[2039 \rightarrow 2040\]

\[30\ 499 \rightarrow 30\ 500\]

\[86\ 999 \rightarrow 87\ 000\]

\[79\ 999 \rightarrow 80\ 000\]

\[\boxed{\mathbf{11}.}\]

\[12 \rightarrow 2\ ед.\]

\[20\ 541 \rightarrow 2\ дес.\ тыс.\]

\[327 \rightarrow 2\ дес.\]

\[237\ 189\ \rightarrow 2\ сот.\ тыс.\]

\[5267 \rightarrow 2\ сот.\]

\[2\ 103\ 458 \rightarrow 2\ ед.\ млн\]

\[2398 \rightarrow 2\ ед.\ тыс.\]

\[23\ 548\ 913 \rightarrow 2\ дес.\ млн\]

\[\boxed{\mathbf{12}.}\]

\[\textbf{а)}\ 9 \cdot 4 = 36\]

\[36 + 14 = 50\]

\[50\ :5 = 10\]

\[10 + 15 = 25\]

\[\textbf{б)}\ 7 + 9 = 16\]

\[16 - 8 = 8\]

\[8 \cdot 9 = 72\]

\[72\ :3 = 24\]

\[\textbf{в)}\ 15 - 6 = 9\]

\[9 \cdot 8 = 72\]

\[72 - 12 = 60\]

\[60\ :4 = 15\]

\[\textbf{г)}\ 49 - 17 = 32\]

\[32\ :8 = 4\]

\[4 \cdot 11 = 44\]

\[44 + 19 = 63\]

\[\textbf{д)}\ 49\ :7 = 7\]

\[7 \cdot 9 = 63\]

\[63 + 17 = 80\]

\[80 - 36 = 44\]

\[\textbf{е)}\ 56 + 38 = 94\]

\[94\ :2 = 47\]

\[47 - 20 = 27\]

\[27\ :3 = 9\]