If you wanted to multiply 587 x 7, you put a finger in the 5,another finger on. The 8, another finger on the 7. Once you fingers in place, you pushed all three keys Down at same time five times! Answer showed up in little window.
never punch the number 7 for the number 7. Use 3 then number 4. 9 is 5 then number 4.
Can,t make it up.
No wait, you got your fingers on 587 then pushed down SEVEN times.