六亿五千万 (liù yì wǔ qiān wàn) — six hundred fifty million (650,000,000)

A drawing of the thing itself, worn down over three thousand years into a few strokes.

The shape of 六 may come from a simple drawing of a shed, or from an ancient counting mark.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

This origin belongs to the traditional form 億; 亿 is its simplified writing.

The traditional form 億 pairs 人 (person) with 意 for its sound; the simplified 亿 is a later shorthand, so its parts are not the original pieces.

A drawing of the thing itself, worn down over three thousand years into a few strokes.

An older form had a crossed mark between a top bar and a bottom bar. The modern 五 keeps those bars, while the original idea is uncertain.

Most characters — around four in five — are built this way: one part hints at the meaning, the other at the pronunciation.

千 pairs 人, whose sound was similar, with 一, a number stroke; the extra line was explained as extension, and a thousand is a number reached by extending counting.

A drawing of the thing itself, worn down over three thousand years into a few strokes.

This origin belongs to the traditional form 萬; 万 is its simplified writing.

For 万, the form 萬 was originally a picture of a scorpion, later borrowed for its sound to write 'ten thousand'; the scorpion picture is unrelated to that number.