AC9M3N05 Year 3 Mathematics

This Content Descriptor from Year 3 Mathematics provides the specific knowledge and skills students should learn. Use it to plan lessons, create learning sequences, and design assessments that align with the Australian Curriculum v9.

estimate the quantity of objects in collections and make estimates when solving problems to determine the reasonableness of calculations

Elaborations

• 1 estimating how much space a grid paper representation of a large number such as \(20 200\) will take up on the wall and how much paper will be required
• 2 estimating the number of people in a large gathering; for example, school assembly, using known numbers, such as how many students per class
• 3 choosing which place value they would estimate to for different situations; for example, they would estimate to the nearest \(10\) when estimating how many dots on a ladybird or they would estimate to the nearest \(1000\) when estimating crowd sizes at a venue
• 4 checking the reasonableness of an addition calculation by using two- and three-digit numbers to the nearest \(10\) or hundred to estimate; for example, using \(200 + 400 = 600\) to estimate and check the solution to the calculation \(219 + 385\)

Related Achievement Standards