If you're looking for a practical way to teach place value, have a look at this Year 3 Represent Numbers up to 1,000 Practical Activities resource. It includes two activities, the first is an independent task where students are asked to generate a 3-digit number using digit cards and find all the different ways they can to represent it. The second is a paired game where students are asked to use dice to generate a 3-digit number and race to represent it in different ways before checking each other's answers. A variety of maths manipulatives are used, including place value counters, Base 10, a part-whole model and a number line.