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Angles in a Right Angle is a free printable Grade 4 maths worksheet on angles summing to ninety degrees, 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 in a Right Angle

4.MD.C.5

NameDate

Work out each answer.

1.Two angles make a right angle. One is 20°. The other is ___
2.Two angles make a right angle. One is 60°. The other is ___
3.Two angles make a right angle. One is 15°. The other is ___
4.Two angles make a right angle. One is 75°. The other is ___
5.Two angles make a right angle. One is 76°. The other is ___
6.Two angles make a right angle. One is 78°. The other is ___
7.Two angles make a right angle. One is 13°. The other is ___
8.Two angles make a right angle. One is 53°. The other is ___
9.Two angles make a right angle. One is 80°. The other is ___
10.Two angles make a right angle. One is 41°. The other is ___
11.Two angles make a right angle. One is 50°. The other is ___
12.Two angles make a right angle. One is 33°. The other is ___

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

Answer key — Angles in a Right Angle

Set 1. Prints on its own sheet.

  1. 1.70°
  2. 2.30°
  3. 3.75°
  4. 4.15°
  5. 5.14°
  6. 6.12°
  7. 7.77°
  8. 8.37°
  9. 9.10°
  10. 10.49°
  11. 11.40°
  12. 12.57°

Questions about Angles in a Right Angle

What does the Angles in a Right Angle worksheet cover?

It practises angles summing to ninety degrees — 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 in a Right Angle 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 in a Right Angle 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 in a Right Angle 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 in a Right Angle 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 in a Right Angle free to print and photocopy?

Yes. Angles in a Right Angle, 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.