New
New
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 5 of 15
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
- There are 90 degrees in a right angle
- Acute angles are between 0 and 90 degrees
- Obtuse angles are between 90 and 180 degrees
- Reflex angles are greater than 180 degrees
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.
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.
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 (2025), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Prior knowledge starter quiz
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?
Look at the hands on this clock face and the arrow. How does the angle created by the hands compare to a right angle?
Smaller than a right angle.
Equal to a right angle.
Q2.Look at the hands on this clock face and the arrow. The angle formed is __________.
Look at the hands on this clock face and the arrow. The angle formed is __________.
a right angle
obtuse
reflex
Q3.Which of the angles shown is an acute angle?
Which of the angles shown is an acute angle?
A
C
Q4.Look at the hands on this clock face and the arrow. The angle formed is __________.
Look at the hands on this clock face and the arrow. The angle formed is __________.
acute
obtuse
reflex
Q5.This is a triangle. Look carefully at the vertices and the angles inside the shape. Which statement is correct?
This is a triangle. Look carefully at the vertices and the angles inside the shape. Which statement is correct?
The triangle has two acute angles and one obtuse 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.
Match the shape to its properties.
Assessment exit quiz
6 Questions
Q1.Which of the angles shown is a right angle?
Which of the angles shown is a right angle?
A
B
Q2.Match the descriptions to the correct number of degrees of turn.
Match the descriptions to the correct number of degrees of turn.
Q3.Which of these is the best estimate for the angle shown?
Which of these is the best estimate for the angle shown?
5°
45°
Q4.Which of these is the best estimate for the angle shown?
Which of these is the best estimate for the angle shown?
50°
110°
180°
Q5.Which of these is the best estimate for the angle shown?
Which of these is the best estimate for the angle shown?
180°
300°
320°
Q6.Which of these is the best estimate for the angle shown?
Which of these is the best estimate for the angle shown?
180°
270°
300°
