2 2 A student: uses appropriate terminology to describe, and symbols to represent, mathematical ideas MA21WM selects and uses appropriate mental or written strategies, or technology, to solve problems MA22WM checks the accuracy of a statement and explains the reasoning used MA23WM uses mental and written strategies for addition and subtraction involving two-, three-, four- and five-digit numbers MA25NA Students: Apply place value to partition, rearrange and regroup numbers to at least tens of thousands to assist calculations and solve problems (ACMNA073) select, use and record a variety of mental strategies to solve addition and subtraction problems, including word problems, with numbers of up to and including five digits, eg 159 + 23: 'I added 20 to 159 to get 179, then I added 3 more to get 182', or use an empty number line: pose simple addition and subtraction problems and apply appropriate strategies to solve them (Communicating, Problem Solving) use a formal written algorithm to record addition and subtraction calculations involving two-, three-, four- and five-digit numbers, eg solve problems involving purchases and the calculation of change to the nearest five cents, with and without the use of digital technologies (ACMNA080) solve addition and subtraction problems involving money, with and without the use of digital technologies use a variety of strategies to solve unfamiliar problems involving money (Communicating, Problem Solving) reflect on their chosen method of solution for a money problem, considering whether it can be improved (Communicating, Reasoning) calculate change and round to the nearest five cents use estimation to check the reasonableness of solutions to addition and subtraction problems, including those involving money Background Information Students should be encouraged to estimate answers before attempting to solve problems in concrete or symbolic form. There is still a need to emphasise mental computation, even though students can now use a formal written method.
2 2 A student: uses appropriate terminology to describe, and symbols to represent, mathematical ideas MA21WM selects and uses appropriate mental or written strategies, or technology, to solve problems MA22WM checks the accuracy of a statement and explains the reasoning used MA23WM uses mental and written strategies for addition and subtraction involving two-, three-, four- and five-digit numbers MA25NA Students: Apply place value to partition, rearrange and regroup numbers to at least tens of thousands to assist calculations and solve problems (ACMNA073) select, use and record a variety of mental strategies to solve addition and subtraction problems, including word problems, with numbers of up to and including five digits, eg 159 + 23: 'I added 20 to 159 to get 179, then I added 3 more to get 182', or use an empty number line: pose simple addition and subtraction problems and apply appropriate strategies to solve them (Communicating, Problem Solving) use a formal written algorithm to record addition and subtraction calculations involving two-, three-, four- and five-digit numbers, eg solve problems involving purchases and the calculation of change to the nearest five cents, with and without the use of digital technologies (ACMNA080) solve addition and subtraction problems involving money, with and without the use of digital technologies use a variety of strategies to solve unfamiliar problems involving money (Communicating, Problem Solving) reflect on their chosen method of solution for a money problem, considering whether it can be improved (Communicating, Reasoning) calculate change and round to the nearest five cents use estimation to check the reasonableness of solutions to addition and subtraction problems, including those involving money Background Information Students should be encouraged to estimate answers before attempting to solve problems in concrete or symbolic form. There is still a need to emphasise mental computation, even though students can now use a formal written method.