Mathematics·Geometry·procedural
Measuring angles (age 9+)
Recognise angle measure as additive; find unknown angles by adding or subtracting on a diagram using equations with a symbol for the unknown
Suggested ages 9–10
Learning journey
Your child is learning to measure and work with angles using protractors, classify shapes by their properties, and understand transformations like reflections and translations while exploring how angles relate to each other.
Evidence of understanding
- Two angles on a straight line are 65° and x°; find x = 115°
- An angle is decomposed into 35° and 40°; state the whole angle is 75°
- Solve: angles at a point are 120°, 90°, and x°; find x = 150°
Assessment prompt
If two angles sit next to each other on a straight line and one is 65°, can Measuring angles (age 9+) work out the other angle — knowing that angles on a straight line always add up to 180°?
Standards alignment
No external standards are linked to this topic.