Angles questions for Primary 4 Maths

Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.

1. What kind of angle measures 120°?

   Answer: Obtuse

   An angle between 90° and 180° is obtuse, and 120° falls in that range.

2. What kind of angle measures 65°?

   Answer: Acute

   An angle smaller than 90° is acute, and 65° is smaller than 90°.

3. Two angles sit on a straight line. One measures 130°. What does the other measure?

   Answer: 50°

   Angles on a straight line add up to 180°, so 180° − 130° = 50°.

4. Three angles meet at a point. Two of them are 150° and 90°. What is the third?

   Answer: 120°

   Angles at a point add up to 360°: 150° + 90° = 240°, and 360° − 240° = 120°.

5. How many degrees are there in a quarter turn?

   Answer: 90°

   A full turn is 360°, so a quarter turn is 360° ÷ 4 = 90°.

6. Through how many degrees does the minute hand of a clock turn in 15 minutes?

   Answer: 90°

   The minute hand turns 360° in an hour, so in a quarter of an hour it turns 90°.

7. How many right angles are there in a rectangle?

   Answer: 4

   A rectangle has a right angle at each of its 4 corners.

8. Two angles on a straight line are equal. What does each one measure?

   Answer: 90°

   They add to 180° and are equal, so each is 180° ÷ 2 = 90°.

9. Which of these angles is the smallest?

   Answer: 35°

   35° is the smallest of 35°, 53°, 89° and 95°.

10. A dancer facing north turns clockwise through 270°. Which direction is she facing now?

    Answer: West

    270° clockwise is three quarter turns: north to east to south to west.