10 strokes
10 strokes, in order. The new stroke in each panel is red; strokes already written are grey.
二倍
nibai
double, twice as much
倍数
baisū
multiple
倍増
baizō
doubling, twofold increase
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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