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Measuring Angles with a Protractor — Easy Worksheet 1
Grade 4 · Whoobee Name: ____________________ Date: __________
Read the protractor and answer each question. Angle measures are in degrees.
How to solve
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Example
What is the measure of the angle?
Answer: 20
Warm-up
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 50. So the angle is 50°.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 50. So the angle is 50°.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 150. So the angle is 150°.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 150. So the angle is 150°.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 40. So the angle is 40°.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 40. So the angle is 40°.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Picture it
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 80. So the angle is 80°. 80° is less than 90°, so it is acute.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 80. So the angle is 80°. 80° is less than 90°, so it is acute.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 100. So the angle is 100°. The right answer is 100°, just as Lena said, so yes.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 100. So the angle is 100°. The right answer is 100°, just as Lena said, so yes.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 30. So the angle is 30°. The right answer is 30°, not 150°, so no.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 30. So the angle is 30°. The right answer is 30°, not 150°, so no.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Think it through
Not quite. The answer is
💡 The angle is either 60° or 120°. It is smaller than a right angle (90°), and 60 is less than 90, so the angle is 60°.
✓ Correct!
Not quite. The answer is
💡 The angle is either 60° or 120°. It is smaller than a right angle (90°), and 60 is less than 90, so the angle is 60°.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
Challenge
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 60. So the angle is 60°. A straight angle is 180°, so it needs 180° − 60° = 120° more.
✓ Correct!
Not quite. The answer is
💡 One ray is on 0 of the inner (red) scale. Read the other ray on that same scale: 60. So the angle is 60°. A straight angle is 180°, so it needs 180° − 60° = 120° more.
💡 How to solve: Measuring Angles with a Protractor
Line up the center of the protractor with the vertex and one ray with 0. Use the scale that starts at 0 on that ray, and follow it to where the other ray crosses. If the angle opens from the left side, read the outer scale; from the right side, read the inner scale. If neither ray is on 0, subtract the two readings.
Try a similar one
What is the measure of the angle?
✓ You've got it! Press Next to keep going. Not yet — the answer is . Read the steps above once more.
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Measuring Angles with a Protractor — Easy Worksheet 1
Read the protractor and answer each question. Angle measures are in degrees.