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Metric system - Wikipedia
Metric system | Definition, Facts, & History | Britannica
Metric System - Chart, Units, Conversion, Examples - Cuemath
Metric System of Measurement - Math is Fun
Metric System (Definition and Examples) | What is the Metric System?
Measurement system - Metric, Units, Conversion | Britannica
SI Units | NIST - National Institute of Standards and Technology
International System of Units - Wikipedia
Understanding Metric | NIST
metric system summary | Britannica