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Measure angles: 4th grade math

Angles as turns; measure with a protractor; additive angles. A free 4th grade lesson plan, a question set with answers and a printable sheet with its key. Copy it and make it yours.

Lesson plan

Goal

  • Students can do this: angles as turns; measure with a protractor; additive angles.

Teach (10 min)

  • Under 90 degrees is acute. Over 90 and under 180 is obtuse.
  • 180 degrees is a straight angle.
  • Work one example on the board while students say each step aloud, then do one together.

Practise (15 min)

  • Students work the printable sheet in pairs, then alone.
  • Or practise it as a game with no sign-up: https://peabody.kids/math/geom.angles?lesson=4-geom-angle-2&at=4

Exit ticket (5 min)

  • Three questions on a slip:
  • 1. An angle measures 37 degrees. What kind of angle is it?
  • 2. An angle measures 170 degrees. What kind of angle is it?
  • 3. An angle measures 40 degrees. What kind of angle is it?

Question set

4 questions that read in words, easiest first. Questions that need a picture are on the printable sheet below.

  1. An angle measures 37 degrees. What kind of angle is it?
  2. An angle measures 170 degrees. What kind of angle is it?
  3. An angle measures 40 degrees. What kind of angle is it?
  4. An angle measures 113 degrees. What kind of angle is it?
Answers
  1. acute
  2. obtuse
  3. acute
  4. obtuse

Printable sheet

Name: ____________________   Date: ____________

Measure angles (4th grade)

  1. What kind of angle is this? (Compare it to a square corner.)
  2. What kind of angle is this? (Compare it to a square corner.)
  3. What kind of angle is this? (Compare it to a square corner.)
  4. Which picture shows an acute angle?
    ABC
  5. Which picture shows a straight angle?
    ABC
  6. An angle measures 149 degrees. What kind of angle is it?
  7. Which picture shows an acute angle?
    ABC
  8. Which picture shows an obtuse angle?
    ABC
  9. What kind of angle is this? (Compare it to a square corner.)
  10. An angle measures 147 degrees. What kind of angle is it?
  11. Which picture shows an acute angle?
    ABC
  12. Which picture shows a right angle?
    ABC
Key
  1. right
  2. obtuse
  3. acute
  4. Picture A
  5. Picture B
  6. obtuse
  7. Picture B
  8. Picture B
  9. straight
  10. obtuse
  11. Picture A
  12. Picture B

Written by Peabody from its own skill pages. Free, no ads, no sign-in. Children can practise this on Peabody. More from teachers: teacher-shared resources.