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Angles on a Straight Line is a free printable Grade 4 maths worksheet on angles summing to one hundred and eighty, aligned to Common Core standard 4.MD.C.5. It prints 12 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 1 of 25 · the same problems every time you open this link.

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All 25 sets ask different questions.

Angles on a Straight Line

4.MD.C.5

NameDate

Work out each answer.

1.Two angles make a straight line. One is 148°. The other is ___
2.Two angles make a straight line. One is 102°. The other is ___
3.Two angles make a straight line. One is 112°. The other is ___
4.Two angles make a straight line. One is 122°. The other is ___
5.Two angles make a straight line. One is 68°. The other is ___
6.Two angles make a straight line. One is 43°. The other is ___
7.Two angles make a straight line. One is 49°. The other is ___
8.Two angles make a straight line. One is 72°. The other is ___
9.Two angles make a straight line. One is 19°. The other is ___
10.Two angles make a straight line. One is 136°. The other is ___
11.Two angles make a straight line. One is 76°. The other is ___
12.Two angles make a straight line. One is 161°. The other is ___

LessonPrint · 4.MD.C.5 · Set 1 · free to copy for classroom use

Answer key — Angles on a Straight Line

Set 1. Prints on its own sheet.

  1. 1.32°
  2. 2.78°
  3. 3.68°
  4. 4.58°
  5. 5.112°
  6. 6.137°
  7. 7.131°
  8. 8.108°
  9. 9.161°
  10. 10.44°
  11. 11.104°
  12. 12.19°

Questions about Angles on a Straight Line

What does the Angles on a Straight Line worksheet cover?

It practises angles summing to one hundred and eighty — 12 questions for Grade 4, all on Common Core 4.MD.C.5: Understand what an angle is. The instruction to pupils is “Work out each answer”, and the answer key follows on the next sheet.

Which Common Core standard does Angles on a Straight Line practise?

CCSS.MATH.CONTENT.4.MD.C.5 — 4.MD.C.5, in the Measurement & Data domain for Grade 4. The published standard reads: “Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement.” The worksheet assesses that standard rather than a paraphrase of it.

What age or grade is this worksheet for?

Angles on a Straight Line is written for Grade 4, typically ages 9-10. It is one of the sheets on 4.MD.C.5, so it suits any pupil working at that standard — including older pupils revisiting it and younger ones working ahead.

Does Angles on a Straight Line come with an answer key?

Yes. All 12 answers are generated from the same problems as the questions, so the key cannot drift out of step with the sheet. It starts on a fresh sheet of paper, after the questions, so it is not handed out with the class by accident.

How many different versions of Angles on a Straight Line can I print?

25 — one per pupil, and all 25 ask different questions. Set 1 downloads the whole class as a single PDF. Every version is fixed to its own address, so a sheet printed today holds the same problems when you reopen it next week.

Is Angles on a Straight Line free to print and photocopy?

Yes. Angles on a Straight Line, its answer key and its 25 versions are free to print and photocopy for your own class, with no account, no email capture and no subscription at the download step. Please do not resell them or republish them as your own.

More practice for 4.MD.C.5

Understand what an angle is.

All Grade 4 worksheets

Last reviewed 2026-09-05. Aligned to 4.MD.C.5 of the Common Core State Standards for mathematics.