mm

Everyday

1. Mm is the short way to write millimetre, a very tiny unit of length. A centimetre has 10 millimetres. tree →
2. «Mm» or «mmm» is also a sound people make to say yes, to think, or to say food is tasty. tree →

In the lessons

a unit of length for small things: pencil leads, rain, insects, lines on a ruler; in science rainfall and small parts are measured in mm; in stories «Mmm!» shows something tastes good

Examples

• The line is 45 mm long. tree →
• It rained 12 mm today. tree →
• A coin is 2 mm thick. tree →
• How many mm are in 3 cm? tree →
• The ant is about 5 mm long. tree →
• The small marks on a ruler are millimetres. tree →
• "Mmm, this soup is yummy!" said Ella. tree →
• "Mm-hm," said Dad, nodding. tree →

Note

Read «mm» as «millimetres»; it names the unit of the number before it. 10 mm = 1 cm, 1000 mm = 1 m. Trap: change units before adding mm to cm; mm is not m (metres).