Name the missing unit of length for each of these objects:
My new pencil is 17
mmcmmkm long
A tree may be 20
mmcmmkm tall
The fire hose is 25
mmcmmkm long
A matchstick is 2
mmcmmkm thick
A plane flies at 10
mmcmmkm above the ground
The glass in the window is 6
mmcmmkm thick
The distance across the water between the North Island and the South Island is 25 mmcmmkm
