diff --git a/20210706/rechnen-1.pdf b/20210706/rechnen-1.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..df7cf95612cb013fea0f545729532f585107222b
Binary files /dev/null and b/20210706/rechnen-1.pdf differ
diff --git a/20210706/rechnen-2.pdf b/20210706/rechnen-2.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..9210e619343299446976553ecc4b8d4062705cec
Binary files /dev/null and b/20210706/rechnen-2.pdf differ
diff --git a/20210706/rechnen-2.tex b/20210706/rechnen-2.tex
new file mode 100644
index 0000000000000000000000000000000000000000..e28345811a0086089e12130de1b0ad2fb2aa6872
--- /dev/null
+++ b/20210706/rechnen-2.tex
@@ -0,0 +1,37 @@
+\documentclass{article}
+
+\usepackage{amsmath}
+
+\begin{document}
+
+  \begin{eqnarray}
+    1384 : 1000 &=& \textbf{1}
+    \\[\medskipamount]
+    (1384 - 1 \cdot 1000 &=& 384) \nonumber\\
+    384 : 100 &=& \textbf{3}
+    \\[\medskipamount]
+    (1384 - 1 \cdot 1000 - 3 \cdot 100 &=& 84)\nonumber\\
+    84 : 10  &=& \textbf{8}
+    \\[\medskipamount]
+    1384 - 1 \cdot 1000 - 3 \cdot 100 - 8 \cdot 10 &=& \textbf{4}
+  \end{eqnarray}
+
+  \begin{align}
+    1384 : 1000 &= \textbf{1}
+    \\[\medskipamount]
+    (1384 - 1 \cdot 1000 &= 384) \nonumber\\
+    384 : 100 &= \textbf{3}
+    \\[\medskipamount]
+    (1384 - 1 \cdot 1000 - 3 \cdot 100 &= 84)\nonumber\\
+    84 : 10  &= \textbf{8}
+    \\[\medskipamount]
+    1384 - 1 \cdot 1000 - 3 \cdot 100 - 8 \cdot 10 &= \textbf{4}
+  \end{align}
+
+  Eine Formel im Text -- wie z.\,B.\ $84 : 10 = 8$ --
+  ist etwas anderes als eine hervorgehobene Gleichung:
+  \begin{equation}
+    \int_0^\pi \sin x\,dx = 2
+  \end{equation}
+
+\end{document}