Year 5

Compare and order acute, obtuse and reflex angles

Year 5

Compare and order acute, obtuse and reflex angles

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Lesson details

Key learning points

  1. In this lesson, we will learn about reflex angles, and then consider how to compare and order acute, obtuse and reflex angles.

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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.

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5 Questions

Q1.
REVISION: Which of these angles is obtuse?
An image in a quiz
1
2
Correct answer: 3
Q2.
Which is the smallest angle?
An image in a quiz
Correct answer: 1
2
3
4
Q3.
Is this statement always, sometimes or never true: "I can draw a triangle with 2 obtuse angles"
Always true.
Correct answer: Never true.
Sometimes true.
Q4.
How many acute, obtuse and right angles are there in this shape?
An image in a quiz
2 obtuse, 0 acute, 3 right angles.
2 obtuse, 3 acute, 0 right angles.
Correct answer: 3 obtuse, 0 acute, 2 right angles.
3 obtuse, 2 acute, 0 right angles.
Q5.
Is this statement always, sometimes or never true: "A quadrilateral has 4 acute angles"
Always true
Correct answer: Never true
Sometimes true

5 Questions

Q1.
A numberline starting at 0 and ending at 10 is divided into 10 equal parts. Each equal part represents:
Correct answer: one
one tenth
ten
Q2.
A numberline starting at 0 and ending at 100 is divided into 10 equal parts. Each equal part represents:
one
one tenth
Correct answer: ten
Q3.
A numberline starting at 0 and ending at 1 is divided into 10 equal parts. Each equal part represents:
one
Correct answer: one tenth
ten
Q4.
A container is filled with four colours of sand. 0.3 of the container is blue, 0.1 is black. Which decimals could represent the yellow and white sand?
0.1 and 0.4
Correct answer: 0.2 and 0.4
0.3 and 0.6
0.5 and 0.2
Q5.
0.7 of a container is filled with water. How much of the container can still be filled?
Correct answer: 0.3
1.3
3