Let's roll up our sleeves and solve this. We have 470 and we're going to multiply it by 20, essentially adding 470 to itself 20 times.
Step 1: 0 + 470 = 470
Step 2: 470 + 470 = 940
Step 3: 940 + 470 = 1410
Step 4: 1410 + 470 = 1880
Step 5: 1880 + 470 = 2350
Step 6: 2350 + 470 = 2820
Step 7: 2820 + 470 = 3290
Step 8: 3290 + 470 = 3760
Step 9: 3760 + 470 = 4230
Step 10: 4230 + 470 = 4700
Step 11: 4700 + 470 = 5170
Step 12: 5170 + 470 = 5640
Step 13: 5640 + 470 = 6110
Step 14: 6110 + 470 = 6580
Step 15: 6580 + 470 = 7050
Step 16: 7050 + 470 = 7520
Step 17: 7520 + 470 = 7990
Step 18: 7990 + 470 = 8460
Step 19: 8460 + 470 = 8930
Step 20: 8930 + 470 = 9400

So, 470*20 = 9400