Degrees and the clock face
Answers are for parents and teachers.
1
Complete: a quarter turn is __°, a half turn is __°, three quarters of a turn is __° and a full turn is __°.
90°, 180°, 270° and 360°.
2
A circle is cut into 12 equal parts. What is the angle of each part? What is the angle of 4 parts together?
360° ÷ 12 = 30°. Four parts: 4 × 30° = 120°.
3
Find the angle between the hands of a clock at 1, 3 and 7 o’clock.
1 o’clock: 1 × 30° = 30°. 3 o’clock: 3 × 30° = 90°. 7 o’clock: from the 7 up to the 12 is 5 spaces, 5 × 30° = 150°.
4
An angle covers 5 of the 8 equal slices of a circle. How many degrees is it?
5 × 45° = 225°.
5
Karim says the hands of a clock make a right angle at 6 o’clock. Is he right? Explain.
No. At 6 o’clock the angle is 6 × 30° = 180°, a straight angle. A right angle (90°) is at 3 o’clock and 9 o’clock.