# Mathematics / Year 4 / Number

Version 9
Curriculum content descriptions

choose and use estimation and rounding to check and explain the reasonableness of calculations including the results of financial transactions (AC9M4N07)

Elaborations
• using proficiency with basic facts to estimate the result of a calculation and say what amounts the answer will be between; for example, $$5$$ packets of biscuits at $$\2.60$$ each will cost between $$\10$$ and $$\15$$ as $$5 \times$$ $$\2 =\10$$ and $$5\times\3=\15$$
• using rounded amounts to complete an estimated budget for a shopping trip or an excursion, explaining why overestimating the amounts is appropriate
• recognising the effect of rounding in addition and multiplication calculations; rounding both numbers up, both numbers down and one number up and one number down, and explaining which is the best approximation and why
General capabilities
• Critical and creative thinking Critical and Creative Thinking
• Numeracy Numeracy
ScOT terms

Estimation,  Rounding

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