 # Length and perimeter: measuring, comparing and calculating

This guide provides a sequence of steps for exploring length and perimeter using metric standard units of millimetres, centimetres and metres. Tasks embed reasoning and problem-solving opportunities.

Year level(s) Year 3, Year 4, Year 5
Audience Teacher
Purpose Teaching resource, Teaching strategies
Teaching strategies and pedagogical approaches Questioning, Explicit teaching
Keywords length, perimeter, measurement, millimetre, centimetre, metre, equivalence, reasoning, explicit teaching

## Curriculum alignment

Curriculum connections Numeracy
Strand and focus Number, Measurement, Build understanding
Topics Addition and subtraction, Length, Using units of measurement
AC: Mathematics (V9.0) content descriptions
AC9M3M01
Identify which metric units are used to measure everyday items; use measurements of familiar items and known units to make estimates

AC9M4M01
Interpret unmarked and partial units when measuring and comparing attributes of length, mass, capacity, duration and temperature, using scaled and digital instruments and appropriate units

AC9M5M01
Choose appropriate metric units when measuring the length, mass and capacity of objects; use smaller units or a combination of units to obtain a more accurate measure

AC9M5M02
Solve practical problems involving the perimeter and area of regular and irregular shapes using appropriate metric units

Numeracy progression Understanding units of measurement (P6, P7, P8)