A very long time ago I had a TEN-KEY calculator that permitted me to do a series of multiplication problems. And, then at the very end I could hit the Grand Total Key and I would have a grand total of ALL of the individual multiplication problems. That was useful when I would calculate the quantities of different dollar denominations. (20 x $1.00) (40 x $5.00) (20 x $10.00) etc. Do ANY Ten-Key Calculators currently have that function any more?
Pretty much all of them do. Some have a (+ =) key while others have a separate (+) and (=) key. To do your problem on one that has a separate (+) and (=): 20 x 1 = + 40 x 5 = + 20 x 10 = + * (answer = $420) You should have your total. (If you have one with the combined key, like in this video, then the = and + step is simply combined into one keystroke.) Let me know if this helped.
Ryan, here are 2 videos: How to multiply: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-f0vuwCVUrpY.html and how to add: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FuIFeWNPXoU.html
