How much longer is 2 cm than 18 mm?

Answer 1

Convert to the same units and the difference can be found:

1 cm = 10 mm

→ 2 cm = 2 × 10 mm = 20 mm

→ 2 cm - 18 mm = 20mm - 18 mm = 2mm

2 cm is 2 mm longer than 18 mm

Alternatively, as 10 mm = 1 cm, 2 mm = 2 ÷ 10 cm = 0.2 cm, it can be expressed as 2 cm is 0.2 cm longer than 18 mm.