CDE Style Manual - Publications (CA Dept of Education)

In general, if an abbreviation can be misunderstood, do not abbreviate. ... ($1.5 million, not $1½ million). Do not drop the word “million” or “billion” in the first part of a range. Example: The plan will cost from $1 . million . to $4 million (not $1 to $4 million). Do not use a hyphen to join numerals with million … ................
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