New
New
Year 5

Describe static angles using the standard unit of degrees when compared to a right angle

I can describe static angles using the standard unit of degrees when compared to a right angle.

New
New
Year 5

Describe static angles using the standard unit of degrees when compared to a right angle

I can describe static angles using the standard unit of degrees when compared to a right angle.

Lesson details

Key learning points

  1. There are 90 degrees in a right angle
  2. Acute angles are between 0 and 90 degrees
  3. Obtuse angles are between 90 and 180 degrees
  4. Reflex angles are greater than 180 degrees

Common misconception

90 degrees is classified as an acute angle and 180 degrees is classified as an obtuse angle.

Provide opportunities for pupils to classify angle sizes and build towards understanding that acute angles are between 0-89 degrees and obtuse angles are between 91-179 degrees. Classifying multiples of right angles as a separate group may help.

Keywords

  • Degrees - A degree is a unit of measure for angles.

  • Estimate - To estimate is to find a value that is close enough to the right answer, usually with some thought or calculation involved.

Take time in the lesson for children to work independently and in pairs to estimate the size of a range of angles. Encourage identification of angle type and reasoning around estimate choice.
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Look at the hands on this clock face and the arrow. How does the angle created by the hands compare to a right angle?
An image in a quiz
Smaller than a right angle.
Equal to a right angle.
Correct answer: Greater than a right angle.
Q2.
Look at the hands on this clock face and the arrow. The angle formed is __________.
An image in a quiz
Correct answer: acute
a right angle
obtuse
reflex
Q3.
Which of the angles shown is an acute angle?
A
Correct answer: B
C
Q4.
Look at the hands on this clock face and the arrow. The angle formed is __________.
An image in a quiz
acute
Correct answer: a right angle
obtuse
reflex
Q5.
This is a triangle. Look carefully at the vertices and the angles inside the shape. Which statement is correct?
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The triangle has two acute angles and one obtuse angle.
Correct answer: The triangle has two acute angles and one right angle.
The triangle has two obtuse angles and one acute angle.
The triangle has two obtuse angles and one right angle.
Q6.
Match the shape to its properties.
Correct Answer:Parallelogram,A quadrilateral with two pairs of parallel sides.

A quadrilateral with two pairs of parallel sides.

Correct Answer:Square ,A quadrilateral with four equal sides and four right angles.

A quadrilateral with four equal sides and four right angles.

Correct Answer:Trapezium ,A quadrilateral with exactly one pair of parallel sides.

A quadrilateral with exactly one pair of parallel sides.

6 Questions

Q1.
Which of the angles shown is a right angle?
A
B
Correct answer: C
Q2.
Match the descriptions to the correct number of degrees of turn.
Correct Answer:Right angle ,90°

90°

Correct Answer:Half turn / straight line,180°

180°

Correct Answer:A full turn,360°

360°

Q3.
Which of these is the best estimate for the angle shown?
An image in a quiz
Correct answer: 30°
45°
Q4.
Which of these is the best estimate for the angle shown?
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50°
110°
Correct answer: 150°
180°
Q5.
Which of these is the best estimate for the angle shown?
An image in a quiz
180°
Correct answer: 270°
300°
320°
Q6.
Which of these is the best estimate for the angle shown?
An image in a quiz
180°
270°
300°
Correct answer: 320°