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Maths · Grade 4 · Set B
Reading the protractor again
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B
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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?
acuteobtuseright
3
Count the small marks. How many degrees is this angle?
4
The ray points at a number. How many degrees is this angle?
5
Use the protractor. What kind of angle is this?
obtuserightacute
6
The ray is one small mark past 150. How many degrees is this angle?
7
This angle measures 110 degrees.
TrueFalse

Judge and compare angles

8
Which angle measures about 60 degrees?
A
B
C
9
Which angle measures more than 90 degrees?
A
B
C
10
How many more degrees is the first angle than the second angle?
11
A 60 degree angle and a 40 degree angle are put side by side. How many degrees in all?
12
Put the angles in order from the smallest to the biggest.
  • C
  • D
  • B
  • A
13
Draw an angle that measures 130 degrees. Use a protractor.
14
Write how you know an angle of 130 degrees is obtuse.
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Answer key · Set B
Reading the protractor again
170 Start at zero on the baseline. The second ray crosses the 70 mark.
2obtuse It is wider than 90 degrees, so it is obtuse.
320 The ray is two small marks past zero, and each small mark is 10. So it is 20 degrees.
4120 The ray crosses the 120 mark.
5acute The ray crosses 50, which is less than 90, so it is an acute angle.
6160 Each small mark is 10, so one mark past 150 is 160 degrees.
7False Start counting at zero on the baseline. The ray crosses 70, so it is 70 degrees.
8B 60 degrees is two thirds of a square corner. Angle A is only about 20 and angle C is a right angle.
9A More than 90 degrees means wider than a square corner. Only angle A is wider; B and C are acute.
1050 80 − 30 = 50 degrees.
11100 Angles add: 60 + 40 = 100 degrees.
124, 2, 1, 3 B is about 20 degrees, D about 50, A about 70 and C about 100.
14Your own words: a grown-up reads it.
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