OK, let's work through this together. We're starting with 940 and we're going to multiply it by 19, which means we add 940 to itself 19 times.
Step 1: 0 + 940 = 940
Step 2: 940 + 940 = 1880
Step 3: 1880 + 940 = 2820
Step 4: 2820 + 940 = 3760
Step 5: 3760 + 940 = 4700
Step 6: 4700 + 940 = 5640
Step 7: 5640 + 940 = 6580
Step 8: 6580 + 940 = 7520
Step 9: 7520 + 940 = 8460
Step 10: 8460 + 940 = 9400
Step 11: 9400 + 940 = 10340
Step 12: 10340 + 940 = 11280
Step 13: 11280 + 940 = 12220
Step 14: 12220 + 940 = 13160
Step 15: 13160 + 940 = 14100
Step 16: 14100 + 940 = 15040
Step 17: 15040 + 940 = 15980
Step 18: 15980 + 940 = 16920
Step 19: 16920 + 940 = 17860

So, 940*19 = 17860