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Percent: 200 + 15% adds 15% of 200 (230). 80 × 25% is a quarter of 80 (20). 15% alone is 0.15.
Order: × and ÷ come before + and −, like on paper: 2 + 3 × 4 = 14. Use brackets to change it: (2 + 3) × 4 = 20. A number right before a bracket or π multiplies: 2π, 3(4 + 1).
Scientific: DEG/RAD switches angles between degrees and radians. EXP types "times ten to the": 3 EXP 8 is 300,000,000. Ans is the last answer. Tap a line in History to use that answer again.
For measurements, areas, tanks, wire sizes and doses, the unit converter & calculators already know the formulas.