AC9M3N05Year 3NumberPractised on site

AC9M3N05 — Year 3 Number

Official Curriculum Content Description:

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

Worked Examples (1)

Example 1Estimation & Rounding Calculations
Estimate the sum of 23+1223 + 12 by first rounding each number to the nearest 1010.
Common mistake: Calculating exact value without rounding or rounding in wrong direction
Correct Answer:3030
Worked Solution:
Round each addend to the nearest 1010: - 23≈2023 \approx 20 - 12≈1012 \approx 10 Add the rounded values: 20+10=3020 + 10 = 30.

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