Use a figure dash to connect digits in a phone number.
For example:
If you want to call me later, my number is 555-0121.
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Use an en dash to show a range of numbers.
For example:
Please read pages 75–100 for homework tonight.
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Use an em dash for any of the following:
1. To showcase things in the middle of an independent clause.
For example:
Three of my favorite foods—ravioli, tiramisu, and gelato—originated in Italy.
James can’t make it—he caught the flu from his sister—but hopefully he’ll be better by tomorrow.
1. To indicate interrupted speech in dialogue.
For example:
“What if we—”
“No, I have a better idea!”
1. To emphasize a sentence.
For example:
You can give Alicia her birthday card—just make sure to send it on time.