add and subtract two- and three-digit numbers using place value to partition, rearrange and regroup numbers to assist in calculations without a calculator

How Bloomi helps with this

This is a NAPLAN-year topic. Bloomi teaches it with a short explainer, guided practice, and NAPLAN-style questions — every one traceable to this exact code.

What this looks like in the classroom

• using partitioning and part-part-whole models and the inverse relationship between addition and subtraction to solve addition or subtraction problems, making informal written “jottings” to keep track of the numbers if necessary
• using physical or virtual grouped materials or diagrams to make proportional models of numbers to assist in calculations; for example, to calculate \(214 + 325\) representing \(214\) as \(2\) groups of \(100\), one group of \(10\) and \(4\) ones and \(325\) as \(3\) groups of \(100, 2\) groups of \(10\) and \(5\) ones resulting in \(5\) groups of \(100, 3\) groups of \(10\) and \(9\) ones which is \(539\)
• choosing between standard and non-standard place value partitions to assist with calculations; for example, to solve \(485 + 365\), thinking of \(365\) as \(350 + 15\), then adding the parts, \(485 + 15 = 500\), \(500 + 350 = 850\)