Angles - Printable Worksheets (4th and 7th Grade) - The Teachers Cafe - Free Printable

To find the measure of each angle, we look at where the blue ray crosses the numbers on the protractor. The bottom ray is always at 0°, so we just read the number where the top ray points. We use the inner scale (the numbers going up from right to left: 10, 20, 30...) because the angle opens to the right.

1)
* Look at the first protractor.
* The bottom ray is on the right side at 0°.
* Follow the inner numbers up: 10, 20, 30, 40, 50, 60.
* The blue ray points exactly at 70.
* So, the angle is 70°.

2)
* Look at the second protractor.
* The bottom ray is on the right side at 0°.
* Follow the inner numbers up: 10, 20, 30... all the way past 90.
* The numbers continue: 100, 110, 120, 130, 140.
* The blue ray points exactly at 150.
* So, the angle is 150°.

3)
* Look at the third protractor.
* The bottom ray is on the right side at 0°.
* This is a small angle. Follow the inner numbers: 10, 20.
* The blue ray points exactly at 30.
* So, the angle is 30°.

4)
* Look at the fourth protractor.
* The bottom ray is on the right side at 0°.
* This is a wide angle. Follow the inner numbers past 90: 100, 110, 120.
* The blue ray points exactly at 130.
* So, the angle is 130°.

Final Answer:
1) Angle: 70°
2) Angle: 150°
3) Angle: 30°
4) Angle: 130°