Wow Hishaam! You have been busy doing some fantastic measuring!
How do you know the cars are in the correct order?
Maybe you coud use the duplo pieces to measure each car and count how many is needed to measure each one and then you can decide which one is the biggest and smallest!
Would the number of duplo pieces you need to measure the car be a bigger or smaller number for the smallest car?
Excellent work Hishaam, you are continuing to gain at home!