\[\boxed{\mathbf{1}.}\]
\[1)\ 58 > 46\]
\[2)\ 428 > 419\]
\[3)\ 3046 > 2999\]
\[4)\ 5975 < 6000\]
\[\boxed{\mathbf{2}.}\]
\[1)\ 19 + 8 = 27\]
\[2)\ 56 + 9 = 65\]
\[3)\ 52 + 43 = 95\]
\[4)\ 94 + 16 = 110\]
\[\boxed{\mathbf{3}.}\]
\[1)\ 15 - 8 = 7\]
\[2)\ 42 - 9 = 33\]
\[3)\ 34 - 16 = 18\]
\[4)\ 125 - 27 = 98\]
\[\boxed{\mathbf{4}.}\]
\[1)\ 13 \cdot 5 = 65\]
\[2)\ 7 \cdot 40 = 280\]
\[3)\ 20 \cdot 30 = 600\]
\[4)\ 15 \cdot 6 = 90\]
\[\boxed{\mathbf{5}.}\]
\[1)\ 48\ :16 = 3\]
\[2)\ 90\ :18 = 5\]
\[3)\ 3200\ :8 = 400\]
\[4)\ 15\ 000\ :100 = 150\]
\[\boxed{\mathbf{6}.}\]
\[34*7 < 3451\]
\[* = 4.\]
\[\boxed{\mathbf{7}.}\]
\[7 + 7 \cdot 3 = 7 + 21 = 28\ (деревьев) - растет\ вокруг\ школы.\]
\[Ответ:28\ деревьев.\]
\[\boxed{\mathbf{8}.}\]
\[24 + (24 - 6) = 24 + 18 = 42\ (шара) - в\ ящике.\]
\[Ответ:42\ шара.\]