<math xmlns="http://www.w3.org/1998/Math/MathML" display="block" dir="rtl">
<mstack>
<msgroup>
<mn>٣٢١</mn>
<msrow>
<mn>٦٥٤</mn>
<mo>+</mo>
</msrow>
</msgroup>
<msline/>
<mn>٩٧٥</mn>
</mstack>
</math>
Author: Abdelshafi Bekhit, school-book of elementary school for mathematics, Province Cairo of Egypt and the same in Arabic probably.
