VC2M6N08

approximate numerical solutions to problems involving rational numbers and percentages, using appropriate estimation strategies

• using familiar fractions, decimals and percentages to approximate calculations, such as 0.3 of 180 is about 1/3 of 180, or 52% is about 1/2
• choosing appropriate estimation strategies including rounding to the nearest whole number, knowledge of multiples of 2, 5 or 10 and partitioning numbers, in contexts such as measuring or cost per unit
• recognising the effect of rounding on calculations involving fractions or decimals and saying what numbers the answer will be between
• recognising the usefulness of estimation to check calculations for contexts such as dividing wood into a number of lengths, calculating cost per unit, reducing a recipe or dividing the cost of dinner for a group into individual amounts
• verifying solutions by estimating percentages in suitable contexts, such as discounts, using common percentages of 10%, 25%, 30%, 50% and 1%
• investigating estimation strategies to make decisions about steam cooking in ground ovens by Aboriginal and/or Torres Strait Islander Peoples, including catering for different numbers of people and resources needed for cooking