15 strokes
15 strokes, in order. The new stroke in each panel is red; strokes already written are grey.
一億
ichioku
100 million
億万長者
okumanchōja
billionaire, very rich person
億単位
okutan'i
in units of hundreds of millions
Study kanji on LenGaki

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Stroke order follows the standard rules — top to bottom, left to right, horizontal before vertical. The eight rules explained.
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