Know that the angles on a straight line sum to 180 degrees and use this to solve problems
Lesson details
Learning outcome
I know that the angles on a straight line sum to 180 degrees and use this to solve problems.
Key learning points
- Angles on a straight line have a sum of 180 degrees.
- To calculate missing angles you can use addition and subtraction.
- Use mental or written strategies to calculate with angles up to 180 degrees.
Keywords
Sum - The sum is the result of adding two or more numbers.
Opposite - If something is opposite, it is placed on the other side.
Common misconception
Pupils think that the angles on a straight line only applied to lines that are horizontal.
Ensure pupils are exposed to straight lines in a range of orientations, encouraging them to draw on the 180 degree angle and how this can apply to both sides of the straight line.
Teacher tip
You might like to create two straight lines that are joined by a split pin at the centre. Slowly rotate one of the lines around to reveal the angles it creates. Once pupils know the size of one of the angles, they can then identify the other angles by beginning to generalise about opposite angles.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Look at the hands on this clock face and the arrow. The angle formed is __________.
Q2.It is 2 o’clock. Imagine the clock now shows half past two. How has the minute hand turned?
Q3.180° is the same as __________.
Q4.The image is not to scale. The image shows part of a right angle. What is needed to complete the right angle? °
Q5.What is the missing value in this bar model? °
Q6.The image is not to scale. What is the value of missing angle a? a = °
Assessment exit quiz
6 Questions
Q1.The image is not to scale. What is the value of missing angle a? a = °
Q2.The image is not to scale. What is the value of missing angle a? a = °
Q3.The image is not to scale. What is the value of missing angle a? a = °
Q4.The image is not to scale. What is the value of missing angle p? p = °
Q5.The image is not to scale. What is the value of missing angle p? p = °
Q6.The image is not to scale. What is the value of missing angle c? c = °
To help you plan your 5 maths lesson on: Know that the angles on a straight line sum to 180 degrees and use this to solve problems, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 5 maths lesson on: Know that the angles on a straight line sum to 180 degrees and use this to solve problems, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 2 maths lessons from the Angles: compare, name, estimate and measure angles unit, dive into the full primary maths curriculum, or learn more about lesson planning.