Max Maths, Year 5, Practice, Adding and subtracting near multiples of 10 and 100

In the Max Maths Year 5 practice exercises, students are introduced to the concept of adding and subtracting near multiples of 10 and 100. The method simplifies calculations by first rounding the numbers to the nearest multiple of 10 or 100 and then adjusting the result accordingly. For example, when adding 381 and 102, one can consider 102 as close to 100. The first step is to add 381 to 100 to get 481. Since 102 is 2 more than 100, students then add the remaining 2 to arrive at the final answer, 483. This technique breaks down the addition process into more manageable steps and helps students understand the importance of place value in addition.

Further practice is encouraged through a series of exercises where students apply this method to both addition and subtraction problems. They are asked to complete sums by counting on in tens or hundreds and then making small adjustments to reach the correct answer. For instance, when adding 573 and 98, students might round 98 to 100, add this to 573 to get 673, and then subtract 2 to account for the initial rounding. Similarly, subtraction problems require students to count back in tens or hundreds before making the necessary adjustments. These exercises not only reinforce the concept of near multiples but also enhance mental arithmetic skills. The workbook provides additional pages for extended practice, ensuring students gain proficiency in this method.