CDE Style Manual - Publications (CA Dept of Education)

Do not begin a sentence with a numeral; spell out the number. Correct: Fifty people gathered at the event. Incorrect: 50 people gathered at the event. Spell out grades and ages. Examples: Sophia is in the tenth grade (or grade ten). Robert is twelve years old. Note: Use a hyphen with an ordinal that describes a student in a specific grade. Example: ................
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