0 (thumb)
Press 0 with your thumb. Amounts often have several zeros in a row, so get used to the thumb rhythm.
Rest your right hand on 4 5 6 of the numeric keypad and press Enter to start. Press Enter after each number
0 00 10 20 30 40 50 60 70 80 90 100 200 500 1000 2000 5000 10000 105 208 306 4070 9080 1500 3000 7500 60000 100000 2050