# Compare and order acute, obtuse and reflex angles

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

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which of these angles is obtuse?

1/5

Q2.Which is the smallest angle?

2/5

Q3.Is this statement always, sometimes or never true: "I can draw a triangle with 2 obtuse angles"

3/5

Q4.How many acute, obtuse and right angles are there in this shape?

4/5

Q5.Is this statement always, sometimes or never true: "A quadrilateral has 4 acute angles"

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.Which of these angles is obtuse?

1/5

Q2.Which is the smallest angle?

2/5

Q3.Is this statement always, sometimes or never true: "I can draw a triangle with 2 obtuse angles"

3/5

Q4.How many acute, obtuse and right angles are there in this shape?

4/5

Q5.Is this statement always, sometimes or never true: "A quadrilateral has 4 acute angles"

5/5

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Recognising Decimal Tenths

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.A numberline starting at 0 and ending at 10 is divided into 10 equal parts. Each equal part represents:

1/5

Q2.A numberline starting at 0 and ending at 100 is divided into 10 equal parts. Each equal part represents:

2/5

Q3.A numberline starting at 0 and ending at 1 is divided into 10 equal parts. Each equal part represents:

3/5

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?

4/5

Q5.0.7 of a container is filled with water. How much of the container can still be filled?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Recognising Decimal Tenths

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.A numberline starting at 0 and ending at 10 is divided into 10 equal parts. Each equal part represents:

1/5

Q2.A numberline starting at 0 and ending at 100 is divided into 10 equal parts. Each equal part represents:

2/5

Q3.A numberline starting at 0 and ending at 1 is divided into 10 equal parts. Each equal part represents:

3/5

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?

4/5

Q5.0.7 of a container is filled with water. How much of the container can still be filled?

5/5

# Lesson summary: Compare and order acute, obtuse and reflex angles

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Walk

On the spot:
Dance