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We have had a solution to this problem from Rebecca in Colchester. She says:

Kimie needs 3 sticks, Sebastian needs 2, the line is 6 altogether.

Other solutions are:

Kimi 6, Sebastian 4, Length 12
Kimi 9, Sebastian 6, Length 18
Kimi 12, Sebastian 8, Length 24

Alistair from Histon and Impington Infants School said:

Yes they can make their lines the same length. Kimie could use three sticks for Sebastian's two. They would both make a line six cubes long. They can make other lines the same length. These will be in the 6 times table.