Math With Mr DJ

Grade 4 · Measurement & Data · 4.MD.C.7

Adding Angles and Finding Unknowns Worksheets

Download the practice worksheet free, with no sign-up. Problems climb from Mild to Spicy, with Mr DJ’s worked example to help you begin. Get the complete teaching materials in the paid lesson pack.

First page of the adding angles and finding unknowns practice worksheet Open the practice worksheet

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Practice prints on US Letter paper. Free for classroom and home use.

Teach it with Mr DJ

One topic. A complete lesson.

  • HomeworkIncluded
  • Exit ticketIncluded
  • Worked answer keyIncluded
  • Lesson slides PDFIncluded
  • Editable lesson slidesIncluded
  • Matching math gameIncluded
  • Build Confidence support guideIncluded
  • Go Deeper extensionIncluded

Print, project, edit and play. The matching game uses the same Math Crew and pepper levels.

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Key idea

Add nonoverlapping adjacent turns; subtract known parts from a labeled whole angle.

Sample problems

  1. A 90° angle is split into two NONOVERLAPPING adjacent angles. One is 35°. Draw and find the other.
  2. A 180° angle is split into two NONOVERLAPPING adjacent angles. One is 65°. Draw and find the other.
  3. A 120° angle is split into two NONOVERLAPPING adjacent angles. One is 45°. Draw and find the other.
  4. Two adjacent angles measure 25° and 40°. Find the combined angle; draw a labeled sketch.

Common mistakes to watch for

  • A student writes 90 + 35 instead of finding the missing part inside the fixed 90° whole.
  • Name the quantities and units before choosing an operation.
  • A claim needs an explanation or a counterexample, not just an answer.

The answer key explains each one, so you can tell what a wrong answer means.

How to use this set

  1. Teach with the slides (about 15 minutes): a warm-up, the big ideas, a “spot the slip” challenge, Mr DJ’s worked example, and a pick-your-pepper round on whiteboards. Or watch the video together.
  2. Practice with the worksheet. Everyone does Mild and Medium, then climbs to Spicy and Extra Spicy.
  3. Check understanding with the exit ticket, and send the homework home.
  4. Mark with the answer key — each answer shows the steps and the most likely mistake. The slides’ teacher notes are in the key too.

More Grade 4 worksheets

All Grade 4 →
Converting Measurement Units4.MD.A.1 · Free practice · Teacher packMeasurement Word Problems4.MD.A.2 · Free practice · Teacher packArea and Perimeter of Rectangles4.MD.A.3 · Free practice · Teacher packLine Plots with Fractions4.MD.B.4 · Free practice · Teacher packAngles and the Protractor4.MD.C.5 · Free practice · Teacher pack
Daily math puzzlesSix new puzzles every day, mild to spicy. Great as a warm-up. Step-by-step videosFree math lessons on YouTube from Mr DJ.

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