This set is all about turns. Fourth graders correct three sentences first — a half turn called 90°, a full rotation labeled 180°, and a 170° angle mistaken for a right angle. Each fix anchors a key benchmark: 180°, 360°, and the obtuse range above 90°.
Fill-in questions tie degrees to everyday motion: a quarter turn (90°), a three-quarter turn (270°), the straight angle on a 6:00 clock, and a door swung halfway open. Short answers ask why four quarter turns make a full rotation and to estimate an obtuse angle at home. Students leave seeing angles everywhere they look.
Style:
Angles and Measurement
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A half turn is 90° because you turn halfway around.
Rewrite: A half turn is 180° because you face the opposite direction.
2. Fix the sentence:
A full rotation measures 180° because you spin all the way around.
Rewrite: A full rotation measures 360° because you spin all the way around back to the start.
3. Fix the sentence:
An angle of 170° is a right angle because it is close to 180°.
Rewrite: An angle of 170° is an obtuse angle because it is greater than 90° but less than 180°.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A quarter turn equals 90 degrees.
2. A three-quarter turn equals 270 degrees.
3. The hands of a clock at 6:00 form a straight angle.
4. When you open a door halfway, it turns about 90 degrees.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. How many quarter turns does it take to make a full rotation? Explain why.
It takes four quarter turns because each quarter turn is 90° and 4 times 90° equals 360°, which is a full rotation.
2. Give an example of an obtuse angle you can see at home and estimate its measure.
A reclining chair leaned back forms an obtuse angle of about 120° between the seat and the backrest.
Angles and Measurement
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
A half turn is 90° because you turn halfway around.
Rewrite: A half turn is 180° because you face the opposite direction.
2) Fix the sentence:
A full rotation measures 180° because you spin all the way around.
Rewrite: A full rotation measures 360° because you spin all the way around back to the start.
3) Fix the sentence:
An angle of 170° is a right angle because it is close to 180°.
Rewrite: An angle of 170° is an obtuse angle because it is greater than 90° but less than 180°.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) A quarter turn equals 90 degrees.
2) A three-quarter turn equals 270 degrees.
3) The hands of a clock at 6:00 form a straight angle.
4) When you open a door halfway, it turns about 90 degrees.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) How many quarter turns does it take to make a full rotation? Explain why.
It takes four quarter turns because each quarter turn is 90° and 4 times 90° equals 360°, which is a full rotation.
2) Give an example of an obtuse angle you can see at home and estimate its measure.
A reclining chair leaned back forms an obtuse angle of about 120° between the seat and the backrest.
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