missing hyphen in '10 degree angle'

When a number and a unit form a single adjective before a noun, bind them with a hyphen: write "10-degree angle," not "10 degree angle." Below are clear rules, quick checks, many copy-ready examples (work, school, casual), and short rewrite templates to fix sentences fast.

If you just want the form, scan the examples and copy the corrected version.

Quick answer

Hyphenate a number+unit when it directly modifies a noun: "a 10-degree angle." Don't hyphenate when the measurement follows the verb: "The angle is 10 degrees."

Attributive (before a noun): hyphenate and use singular unit - 10-degree angle, 5-mile run.
Predicative (after a verb): no hyphen and use plural unit - the angle is 10 degrees, the run is 5 miles.
If the hyphen feels awkward, rewrite: "an angle of 10 degrees" or "a ten-degree shift."

Core explanation

When number + unit functions as a compound adjective directly before a noun, the hyphen shows the words belong together. When the measurement comes after a verb or uses "of," keep the unit plural and drop the hyphen.

Attributive: [number]-[unit] [noun] → hyphen + singular unit (10-degree angle).
Predicative: [noun] is/was [number] [units] → no hyphen + plural unit (the angle is 10 degrees).
Style guides differ on numerals vs. words, but hyphenation rules are the same either way.

Hyphenation with measurements and units

Apply the rule consistently across degrees, miles, hours, grams, mL, years, etc. Use singular inside modifiers; plural in predicates. Use an en dash for ranges and keep hyphens for compound modifiers.

Hyphen + singular (modifier): 3-foot ladder, 10-degree tilt, 5-page appendix.
No hyphen + plural (predicate): the ladder is 3 feet tall; the tilt was 10 degrees.
Ranges: typographically use an en dash (10-15 degrees); in casual text a hyphen often appears but the en dash is correct for spans.

Spacing and punctuation

Hyphens have no spaces on either side: "10-degree" not "10 - degree." Keep the hyphenated unit intact when followed by punctuation.

No spaces: 2-week plan, five-year-old, 3-hour meeting.
Use an en dash for numeric ranges: 10-12 pages (typographically correct).
Fractions and decimals can make modifiers awkward. Prefer "2.5-hour prototype" or rewrite as "a prototype that lasted two and a half hours."

Real usage - tone and style choices

Different contexts affect number form but not hyphenation. Choose the format your audience expects and keep compound modifiers hyphenated before nouns.

Academic: spell out small numbers and hyphenate - a ten-degree increase.
Technical: use numerals and hyphenate - 10-degree camber.
Casual: readers understand missing hyphens, but proper hyphenation improves clarity in texts and posts.

Rewrite help

If the hyphenated form looks awkward, pick a rewrite that preserves precision without losing clarity.

Template A (Attributive): [number]-[unit] [noun] → add hyphen. Example: 10-degree angle.
Template B (Predicative): [noun] is [number] [units] → move measurement after verb. Example: The angle is 10 degrees.
Template C (Of-construction): [noun] of [number] [units] → avoids hyphen. Example: an angle of 10 degrees.

Rewrite 1 - Wrong: He made a 10 degree correction. →
Right: He made a 10-degree correction.
Rewrite 2 - Wrong: The experiment used a 5 ml sample. →
Alternative: The experiment used a sample of 5 mL.
Rewrite 3 - Wrong: We need a 2 week plan. →
Right: We need a two-week plan (or: a plan of two weeks).

Try your own sentence

Test the full sentence rather than the isolated phrase - context usually shows whether to hyphenate. If the measurement sits directly before the noun, bind it; if it follows a verb, don't.

Examples - wrong/right pairs (work, school, casual)

Each pair shows the incorrect form without a hyphen and the corrected hyphenated form. Copy the corrected line when you need a quick fix.

Work - Wrong: Please send the 10 minute status update to the team. →
Right: Please send the 10-minute status update to the team.
Work - Wrong: Attach the 5 page appendix to the report. →
Right: Attach the 5-page appendix to the report.
Work - Wrong: The client needs a 2 week turnaround. →
Right: The client needs a 2-week turnaround.
School - Wrong: Record the 10 degree angle at each trial. →
Right: Record the 10-degree angle at each trial.
School - Wrong: We surveyed a 1 meter area for the project. →
Right: We surveyed a 1-meter area for the project.
School - Wrong: The sample was a 2 gram piece taken from the edge. →
Right: The sample was a 2-gram piece taken from the edge.
Casual - Wrong: I hit a 10 degree bump on the bike path. →
Right: I hit a 10-degree bump on the bike path.
Casual - Wrong: We had a 3 hour layover at the airport. →
Right: We had a 3-hour layover at the airport.
Casual - Wrong: She adopted a two year old kitten last weekend. →
Right: She adopted a two-year-old kitten last weekend.

Memory trick and quick checks

Mnemonic: "Before = Bind." If number+unit comes before the noun, bind them with a hyphen.

Check 1: Is the number+unit directly before a noun and describing it? If yes, hyphenate.
Check 2: Does the phrase follow a verb or use "of"? If yes, don't hyphenate.
Quick test: Replace the numeral with "one." If "one-unit noun" sounds natural, hyphenate.

Similar mistakes

People often confuse hyphens with en dashes or drop hyphens in age/weight/time constructions. Watch unit plurality inside modifiers versus predicates.

Age: a six-year-old child (hyphen) vs the child is six years old (no hyphen).
Ranges: typographic rule uses an en dash - 10-12 pages; as a modifier: a 10-12-mile course.
Units: use singular in hyphenated modifiers (10-degree) and plural in predicates (10 degrees).

Example mistake - Wrong: The runner completed a 10-12 mile course. →
Right: The runner completed a 10-12-mile course (en dash for range, hyphen for modifier).
Common correct forms - Weight: a 10-pound bag; Time: a 24-hour window; Age: a 7-year-old contestant.

Grammar quick note

Attributive (before noun): hyphenate and use singular unit. Predicative (after verb): don't hyphenate and use plural unit.

When decimals or fractions make the modifier messy, prefer numeric notation with a hyphen ("2.5-hour test") or an "of" construction ("a test that lasted two and a half hours").

Attributive: a 4-inch gap (hyphen + singular).
Predicative: The gap was 4 inches (no hyphen + plural).
When in doubt, rewrite for clarity.

FAQ

Do I write 10-degree angle or 10 degree angle?

Write 10-degree angle when the measurement modifies the noun directly. If the measurement follows the noun, write the unit plural and do not hyphenate: the angle is 10 degrees.

Should I spell out numbers like ten-degree or use numerals?

Follow your style guide. Many guides spell out numbers under 10 in narrative text (a ten-degree shift) but allow numerals in technical writing (a 10-degree shift). Either way, hyphenate the compound modifier that precedes a noun.

When do I use an en dash instead of a hyphen?

Use an en dash for numeric ranges (10-15 degrees). Use a hyphen for compound modifiers (10-degree increase). In casual text a hyphen often appears for ranges, but the en dash is typographically correct.

Is it okay to skip hyphens in emails or Slack messages?

Casual chat readers usually understand missing hyphens, but hyphenating improves clarity and professionalism. For official notes or deliverables, hyphenate compound modifiers.

How can I find and fix hyphenation errors across a document quickly?

Search for patterns like a number followed by a unit ("10 degree", "5 page", "2 week"). Use a grammar tool or regex to locate matches and decide: if the phrase appears before a noun, hyphenate and use the singular unit; if it follows a verb, use the plural and no hyphen.

Want a quick fix for a sentence?

Paste a sentence into a grammar checker to see hyphenation suggestions, or apply the rewrite templates above: add a hyphen, move the measurement after the verb, or use an "of" construction.

If you'd like, paste one sentence here and we'll show the corrected versions (hyphenated and rewritten).