This calculator works the way a physical desktop calculator does: it evaluates left to right, in the exact order you press the keys, rather than applying formal order-of-operations rules. Type 5, +, 3, ×, 2, = and you'll get 16 — because pressing "×" immediately computes 5 + 3 = 8 first, then multiplies that running total by 2. True PEMDAS order would give 11 (multiply 3 × 2 first, then add 5), which is what a scientific calculator or spreadsheet formula would produce for the same expression typed as text. Neither behavior is "wrong" — they're just two different, equally standard conventions — but it's worth knowing which one you're using before trusting a multi-step calculation.
The memory is a single separate number, independent of whatever's on the screen. M+ adds the current display value into memory; M− subtracts it; MR recalls the stored value onto the screen; MC clears memory back to zero. That makes it useful for running a subtotal while the main display is busy with a different calculation — compute an expense, press M+ to add it to the running total, clear the screen and compute the next expense, press M+ again, and MR at the end recalls the accumulated sum without needing to retype anything.
No — like most simple calculators, it processes operations in the order you enter them rather than applying formal precedence rules. For complex expressions, enter one operation at a time.
M+ adds the current number to memory, M- subtracts it, MR recalls the stored value, and MC clears memory back to zero.
Yes — number keys, +, -, *, /, Enter for equals, and Backspace all work while this page is focused.