Tepaia - Convert these measurements to either mm or cm

Convert these measurements to either mm or cm

1 a. 50mm  = 5cm	1 b. 80mm  = 8cm
2 a. 30 mm  = 3 cm	2 b. 2 cm  = 20mm
3 a. 10 mm  = 1cm	3 b. 10 cm  = 100mm
4 a. 6 cm  = 60mm	4 b. 7 cm  = 70mm
5 a. 40mm  = 4cm	5 b. 9 cm  = 90mm
6 a. 30mm  = 3cm	6 b. 3 cm  = 30mm
7 a. 10 cm  = 100 mm	7b. 100mm  = 10cm