Practice: Angles & Angle Measurement

Grade 4 Mathematics

Name:
Date:
Directions: Classify angles, measure with a protractor, and solve angle problems. Remember: Acute < 90°, Right = 90°, Obtuse is between 90° and 180°, Straight = 180°.

Part A: Classify Each Angle (Write acute, right, obtuse, or straight)

1.

75°

2.

90°

3.

142°

4.

180°

5.

30°

6.

105°

7.

89°

8.

168°

Part B: Use a Protractor to Measure Each Angle

9.
°
10.
°
11.
°
12.
°
13.
°
14.
°

Part C: Draw an Angle with the Given Measure

15. Draw a 45° angle
16. Draw a 90° angle
17. Draw a 120° angle
18. Draw a 60° angle

Part D: Find the Unknown Angle

19. Angles A and B form a straight line (180°). If angle A = 65°, what is angle B?

180° - 65° = °

20. Angles C and D form a right angle (90°). If angle C = 35°, what is angle D?

90° - 35° = °

21. Angles E and F share a side. Together they measure 130°. If angle E = 75°, what is angle F?

°

22. Angle G and angle H form a straight line. If angle G = 112°, what is angle H?

°

23. Two angles share a side. One angle is 48° and the total is 90°. What is the unknown angle?

°

24. Three angles share sides and total 180°. Two of them are 60° and 45°. What is the third angle?

°

Part E: Add the Angles

25. 35° + 55° = °

What type of angle is the sum?

26. 70° + 110° = °

What type of angle is the sum?

27. 45° + 45° = °

What type of angle is the sum?

28. 25° + 40° + 25° = °

What type of angle is the sum?

29. 60° + 60° + 60° = °

What type of angle is the sum?

30. 90° + 45° + 45° = °

What type of angle is the sum?

FAST Success Kit | Grade 4 | FL B.E.S.T. Standards: MA.4.GR.1.1-1.3