# Area and perimeter of rectangles

New Zealand Curriculum: Level 3 to early Level 4

Learning Progression Frameworks: Measurement Sense, Signpost 5 to Signpost 7

#### Target students

These activities are intended for students who understand how to use metric units of measure to find lengths. When working with units, they should understand the following:

• Units relate to the attribute being measured (for example, length is measured with iterations of length).
• Identical units need to be used when measuring.
• Units should be tiled (or iterated) with no gaps or overlaps to create a measure.
• Units can be equally partitioned into smaller units when greater accuracy is needed.

Students should also know how to use a measurement scale, such as a ruler or tape measure. They should be familiar with the most common metric units of length, metres, centimetres, and possibly millimetres, though they may not be able to convert measures (e.g., 45cm = 450mm). Students should also have a partial or full grasp of their basic multiplication and division facts.

The following diagnostic questions indicate students’ understanding of, and ability to find the areas and perimeters of flat spaces, particularly rectangles. Allow access to pencil and paper and to a calculator if students need it. (show diagnostic questions)