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Tavin from The Spinney Primary School in the United Kingdom wrote:

Yes, 4 different types (red, pink, yellow and orange)

Barron from Pakuranga Heights School in  New Zealand wrote:

Matts train is 20 blocks long and orange is 10 squares so put 2 oranges same length 2x10=20 half orange it makes yellow which is 5 blocks 5x4=20
4x5= 20 pink is 4 put 5 pinks = 20
10 x 2 put 10 reds = 20


Sam from Raymond Park Middle School in the USA sent in the following:

Here's another one.

 
Well done it looks af if you explored the lengths in a good way.