Addition and subtraction - Estimate numbers - Worksheet

The "Estimate Answers" worksheet is an educational resource designed to teach children the importance and application of estimation in mathematical calculations. This activity aligns with the National Curriculum objective of estimating the result of a calculation and checking answers using inverse operations. The worksheet provides differentiated sheets and teaching slides to support the learning process. The key vocabulary for this lesson includes 'estimate', 'calculation', 'inverse operations', and 'near numbers'. Children are encouraged to use estimation before precisely working out calculations, which helps them gauge the reasonableness of their answers and understand how estimation can be beneficial in real-life scenarios.

The worksheet guides children through various exercises where they use near numbers, such as multiples of 100 or 50, to estimate the outcomes of calculations involving two or three numbers. For instance, they might be asked to estimate the sum of 309 + 104 by rounding these numbers to the nearest hundred and then performing the simplified calculation. Additionally, the worksheet includes reasoning and problem-solving activities where children create their own calculations to achieve an estimated answer of a specific value, such as 100, 50, or 80. This task requires them to apply their understanding of estimation and rounding to find numbers that, when combined, produce an approximate result close to the given target.