Measure Obtuse Angles is a free printable Grade 4 math worksheet on using a protractor's outer scale on angles over 90 degrees, aligned to Common Core standard 4.MD.C.5. It prints 8 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students 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.
Next set4.MD.C.5
Measure each angle.
LessonPrint · 4.MD.C.5 · Set 1 · free to copy for classroom use
Set 1. Prints on its own sheet.
It practices using a protractor's outer scale on angles over 90 degrees — 8 questions for Grade 4, all on Common Core 4.MD.C.5: Understand what an angle is. The instruction to students is “Measure each angle”, and the answer key follows on the next sheet.
CCSS.MATH.CONTENT.4.MD.C.5 — 4.MD.C.5, under Measurement & Data 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.
Measure Obtuse Angles is written for Grade 4, typically ages 9-10. It is one of the sheets on 4.MD.C.5, so it suits any student working at that standard — including older students revisiting it and younger ones working ahead.
Yes. All 8 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.
25 — one per student, 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.
Yes. Measure Obtuse Angles, 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.
Understand what an angle is.
Last reviewed 2026-09-05. Aligned to 4.MD.C.5 of the Common Core State Standards for Mathematics.