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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 25 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 76°. The other is ___
2.Two angles make a straight line. One is 165°. The other is ___
3.Two angles make a straight line. One is 59°. The other is ___
4.Two angles make a straight line. One is 111°. The other is ___
5.Two angles make a straight line. One is 158°. The other is ___
6.Two angles make a straight line. One is 105°. The other is ___
7.Two angles make a straight line. One is 136°. The other is ___
8.Two angles make a straight line. One is 129°. The other is ___
9.Two angles make a straight line. One is 127°. The other is ___
10.Two angles make a straight line. One is 134°. The other is ___
11.Two angles make a straight line. One is 34°. The other is ___
12.Two angles make a straight line. One is 146°. The other is ___

LessonPrint · 4.MD.C.5 · Set 25 · free to copy for classroom use

Answer key — Angles on a Straight Line

Set 25. Prints on its own sheet.

  1. 1.104°
  2. 2.15°
  3. 3.121°
  4. 4.69°
  5. 5.22°
  6. 6.75°
  7. 7.44°
  8. 8.51°
  9. 9.53°
  10. 10.46°
  11. 11.146°
  12. 12.34°

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