Short Blocks

Maths Year 5 Spring Shape (B)

Each unit has everything you need to teach a set of related skills and concepts.

Recognise, measure and draw angles (suggested as 2 days)

Planning and Activities

Day 1 Teaching
Using an online protractor, show how to align the protractor to read the angle. Point out how the numbers of degrees go both anticlockwise and clockwise; this is the case on many protractors! Measure angles of 90°, 180°, 270°. Show different angles for children to estimate then measure.
Group Activities
Use the in-depth problem-solving investigation ‘Nine-pin triangles’ from NRICH as today’s group activity.
Or, use this activity:
-- Accurately draw and measure angles.

Day 2 Teaching
Introduce acute, obtuse and reflex angles.
Launch ‘Angles’ from www.mathsisfun.com. Scroll down to 'Try it yourself' and move the top line of the angle anticlockwise to gradually increase it from 1° to 360°, asking children to watch the angle titles at the side. Draw some angles, and children classify them as acute, obtuse or reflex.
Group Activities
-- Classify angles as acute, obtuse or reflex through shape investigation.

You Will Need

  • IWB and internet access
  • Whiteboards
  • Rulers
  • Protractors
  • 1–6 dice

Mastery: Reasoning and Problem-Solving

  • Draw an acute angle, estimate its size. Write your estimate. Then measure it. How close were you?
    Repeat this for an obtuse angle.
  • Draw a pentagon with two right angles and two obtuse angles. Can you draw a pentagon with three acute angles?
  • True or False?
    A quadrilateral could have two reflex angles.

In-depth investigation: Nine-pin Triangles
Draw triangles; measure and classify the angles of each triangle. Nine-pins Triangles from nrich.maths.org.

Extra Support

Ask the Angle!
Recognising acute, right and obtuse angles.