A class of children order a set of cards numbered from 1 to 500 using hundreds, tens and units. Numbervator asks the children to sort the cards into groups of 1-100, 101-200, 201-300 and 401-500. He then asks the children to sort each group of 100 cards into groups of ten. Finally the children are asked to order each group of ten cards into the correct sequence of units. The cards are then displayed from 1-500 in the correct order.
Once the pupils have watched this clip, they can then be challenged to order numbers on a number line by looking at the hundreds first, then the tens, then the units. Making their own abacuses with different colour beads for hundreds, tens and units can also help to consolidate the value of different three-digit numbers. Finally, children can be given sets of three-digit numbers to order from smallest to largest using the strategy of comparing hundreds, then tens, then units. Using cereal packets and food packaging, children could be asked to order them in size by looking at how much they weigh. The same could be done with the volume of different liquid containers.