This set focuses on protractor habits and angle estimation. Fourth graders fill in that protractor reading starts at 0°, that 95° and 91° are obtuse, and that the inner scale shows 50° when the outer reads 130° — the exact trap that causes most measurement mistakes.
Clock angles thread through the page: 9:00 forms a right angle, a hand sweeping 12 to 3 covers 90°, and a matching grid pairs 12:00, 3:00, 6:00, and 1:00 with 0°, 90°, 180°, and 30°. Students walk away reading either protractor scale with confidence and seeing time itself in degrees.
Style:
Angles and Measurement
Part A: Fill in the Blank
Write the missing word or number on each line.
1. When reading a protractor, always start counting from 0 degrees.
2. An angle slightly larger than a right angle, say 95°, is classified as obtuse.
3. If a protractor shows 130° on the outer scale, the inner scale reads 50 degrees.
4. The hands of a clock at 9:00 form a right angle measuring 90°.
5. An angle that measures exactly 0° means the two rays overlap.
6. The supplement of a 45° angle is 135 degrees.
7. An angle of 91° is obtuse because it is just over 90°.
8. The complement of a 60° angle is 30 degrees.
9. A clock hand moving from 12 to 3 sweeps 90 degrees.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
Clock at 12:00
→ 0°
30°
Clock at 3:00
→ 90°
90°
Clock at 6:00
→ 180°
180°
Clock at 1:00
→ 30°
0°
Angles and Measurement
★ Part A: Fill in the Blank
Write the missing word or number on each line.
1) When reading a protractor, always start counting from 0 degrees.
2) An angle slightly larger than a right angle, say 95°, is classified as obtuse.
3) If a protractor shows 130° on the outer scale, the inner scale reads 50 degrees.
4) The hands of a clock at 9:00 form a right angle measuring 90°.
5) An angle that measures exactly 0° means the two rays overlap.
6) The supplement of a 45° angle is 135 degrees.
7) An angle of 91° is obtuse because it is just over 90°.
8) The complement of a 60° angle is 30 degrees.
9) A clock hand moving from 12 to 3 sweeps 90 degrees.
★ Part B: Matching
Match each item on the left to the correct answer on the right.
1) Match each item to its correct answer.
Clock at 12:00
→ 0°
30°
Clock at 3:00
→ 90°
90°
Clock at 6:00
→ 180°
180°
Clock at 1:00
→ 30°
0°
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10 Questions
10-15 minutes
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