L7 Find 100 More

This Year 3 maths lesson focuses on helping children understand how to find 100 more than a number within 1,000, building on previous place value learning from Year 2 and earlier Year 3 lessons. The starter revisits counting in multiples of 100, highlighting how the hundreds digit increases each time, and introduces the thousand digit when numbers exceed 999. In the introduction, students explore how to find 100 more using place value charts and Base 10 counters, comparing the process to finding 10 more to discuss which is easier and why. Animated examples, such as finding 100 more than 137 up to 937, demonstrate how the hundreds digit increases while the tens and ones digits remain unchanged. Children also learn the importance of placeholders, especially when adding 100 to single-digit numbers. During the activity, children generate 3-digit numbers and represent them on place value charts using place value counters. They then find 100 more and show this visually by adding a 100-counter in the correct column, reinforcing the concept of place value and helping them see when exchanges are necessary. The plenary consolidates learning with a common misconception example: adding 100 to 12. Students identify the mistake (thinking it becomes 102 instead of 112) and discuss when placeholders are needed. Common misconceptions addressed include adding 1 to the tens or ones digits, confusing adding 100 with multiplying by 10, and counting in ones instead of hundreds. This resource is ideal for teachers seeking a hands-on, interactive Year 3 lesson on finding 100 more, place value, and addition within 1,000, with activities designed to reinforce conceptual understanding and prevent common errors.