Hyphenating compounds starting with a number

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Hyphenate a compound in which a number is the first element and the compound precedes the noun it modifies.

A 5-cm incision
A 2-way street
A 7-fold increase

NOTE: If these started a sentence (remove the article), the number would be spelled out and the hyphen would remain.

Five-cm incision
Two-way street
Seven-fold increase