Quick, without looking it up, can you tell me what the {mc, m+, m-, mr} buttons do? If you're asking "the what buttons?" or "that's not on my calculator" then we have an answer. If you do know these, did you just intuit them or did you learn them from some instruction? If you really did intuit them, do you really think that's how most people do it? (did you actually intuit them...)
Quick, without looking it up, can you tell me what the {mc, m+, m-, mr} buttons do? If you're asking "the what buttons?" or "that's not on my calculator" then we have an answer. If you do know these, did you just intuit them or did you learn them from some instruction? If you really did intuit them, do you really think that's how most people do it? (did you actually intuit them...)