Quarter 1, Week 4 a.) What do you call this small cube? It is a unit. b) What number is represented by one unit? It represents one. (c) How about this pile of 10 cubes? It is a long. (d) What number is represented by one long? It represents 10. 1 long is made up of 10 units. (e) How about this group of 10 longs? It is a flat. (f) What number is represented by one flat? It represents 100. 1 flat is made up of 10 longs or 100 units.