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Maths · Grade 4 · Set A
Reading the protractor
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Goal: 15 min
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Remember: Put the baseline along zero. Start at zero and read the mark where the second ray crosses, counting the small marks past the last number.

Read the degrees

1
The baseline lies along zero. How many degrees is the angle?
2
Is the angle acute, right or obtuse?
acuterightobtuse
3
Read the protractor. How many degrees is this angle?
4
Count the small marks. How many degrees is this angle?
5
Use the protractor. What kind of angle is this?
obtuserightacute
6
The ray points past 120. How many degrees is this angle?
7
This angle measures 140 degrees.
TrueFalse

Judge and compare angles

8
Which angle measures about 30 degrees?
A
B
C
9
Which angle is obtuse?
A
B
C
10
How many more degrees is a 150 degree angle than a 90 degree angle?
11
A 20 degree angle and a 50 degree angle are put side by side. How many degrees in all?
12
Put the angles in order from the smallest to the biggest.
  • A
  • C
  • B
13
Draw an angle that measures 60 degrees. Use a protractor.
14
Write what you do first when you read a protractor.
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Answer key · Set A
Reading the protractor
160 Start at zero on the baseline. The second ray crosses the 60 mark.
2obtuse It is wider than 90 degrees, so it is obtuse.
340 The ray is one small mark past 30, and each small mark is 10. So it is 40 degrees.
480 The ray is two small marks past 60, and each small mark is 10. So it is 80 degrees.
5right The ray crosses 90, a square corner, so it is a right angle.
6130 The ray is one small mark past 120, and each small mark is 10. So it is 130 degrees.
7False Start counting at zero on the baseline. The ray is close to zero and crosses 40, so it is 40 degrees.
8B 30 degrees is a narrow opening, a third of a square corner. Angle A is obtuse and angle C is about 70.
9A An obtuse angle is wider than a square corner. Angle B is a right angle and angle C is acute.
1060 150 − 90 = 60 degrees.
1170 Angles add: 20 + 50 = 70 degrees.
123, 2, 1 B is acute, C is a right angle and A is obtuse.
14Your own words: a grown-up reads it.
Mark each answer, count the right ones and write the score on the sheet.