ASPECTS OF NUMERACY FOCUS AREA 1 ESTIMATING AND PROBLEM SOLVING early in STAGE 2 Estimates and checks the solution to a problem Models and applies the associative property for addition e.g. 2 + 3 + 8 = 2 + 8 + 3 = 10 + 3 = 13 Models and applies the commutative property for multiplication e.g. 5 x 8 = 8 X 5 end of STAGE 2 Estimates the solution to a problem, checks the solution and communicates the mathematical thinking Uses +, - as inverse operations to check calculations Print