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

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Set 1 has all 25 in a single PDF. 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 123°. The other is ___
2.Two angles make a straight line. One is 119°. The other is ___
3.Two angles make a straight line. One is 46°. The other is ___
4.Two angles make a straight line. One is 99°. The other is ___
5.Two angles make a straight line. One is 129°. The other is ___
6.Two angles make a straight line. One is 96°. The other is ___
7.Two angles make a straight line. One is 121°. The other is ___
8.Two angles make a straight line. One is 71°. The other is ___
9.Two angles make a straight line. One is 67°. The other is ___
10.Two angles make a straight line. One is 77°. The other is ___
11.Two angles make a straight line. One is 33°. The other is ___
12.Two angles make a straight line. One is 51°. The other is ___

LessonPrint · 4.MD.C.5 · Set 10 · free to copy for classroom use

Answer key — Angles on a Straight Line

Set 10. Prints on its own sheet.

  1. 1.57°
  2. 2.61°
  3. 3.134°
  4. 4.81°
  5. 5.51°
  6. 6.84°
  7. 7.59°
  8. 8.109°
  9. 9.113°
  10. 10.103°
  11. 11.147°
  12. 12.129°

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