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Why does 3 + 4 × 2 give 14?
Calc is a desk calculator and works left to right, like the machine on a desk. Enter 4 × 2 first to get 11.
The display shows fewer decimals than I typed
The DECIMAL knob rounds what you see. Turn it to F and the window shows every figure that fits.
Something else? Write to hello@objectism.app. Say which iPhone and which iOS, and what you pressed.