VC2M3N06

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

• 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
• estimating the number of people in a large gathering (for example, a school assembly) using known numbers (such as how many students per class)
• choosing which place value they would estimate to for different situations; for example, choosing to estimate to the nearest ten when estimating how many dots on a ladybird or choosing to estimate to the nearest thousand when estimating crowd sizes at a venue
• checking the reasonableness of an addition calculation by using two- and three-digit numbers to the nearest ten or hundred to estimate; for example, using 200 + 400 = 600 to estimate and check the solution to the calculation 219 + 385