SI units are used in Science Classes because they are universal and standard, and they are also easier to use because they are based no the power of ten.
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Because SI units are globally recognised (with the exception of Burma, Liberia and USA). SI stands for 'System International' See the related link to WIkipedia for more information.
SI units
SI units are important because it is a universal means of communicating different types of measurements.
SI is from the French Système international d'unités, which means International System of Measurements. - Wikipedia
Si unit