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Scientific notation: a × 10^n where 1 ≤ |a| < 10. To multiply: multiply coefficients, add exponents. To divide: divide coefficients, subtract exponents. To add/subtract: align exponents first. Useful for very large (Avogadro's number: 6.022 × 10²³) or very small (electron mass: 9.109 × 10⁻³¹ kg) quantities. Engineering notation uses exponents in multiples of 3 (kilo, mega, giga).
6.02214076e+23