Know that the angles on a straight line sum to 180 degrees and use this to solve problems
I know that the angles on a straight line sum to 180 degrees and use this to solve problems.
Know that the angles on a straight line sum to 180 degrees and use this to solve problems
I know that the angles on a straight line sum to 180 degrees and use this to solve problems.
These resources will be removed by end of Summer Term 2025.
Switch to our new teaching resources now - designed by teachers and leading subject experts, and tested in classrooms.
These resources were created for remote use during the pandemic and are not designed for classroom teaching.
Lesson details
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.
Licence
Lesson video
Loading...
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 = °
