Answer :
1 cm = 10 millimetres
10 cm = 100 millimetres
100 cm = 1,000 millimetres = 1 metre
Therefore:
4 metres = 4,000 millimetres
10 cm = 100 millimetres
100 cm = 1,000 millimetres = 1 metre
Therefore:
4 metres = 4,000 millimetres