Let's roll up our sleeves and solve this. We have 704 and we're going to multiply it by 20, essentially adding 704 to itself 20 times.
Step 1: 0 + 704 = 704
Step 2: 704 + 704 = 1408
Step 3: 1408 + 704 = 2112
Step 4: 2112 + 704 = 2816
Step 5: 2816 + 704 = 3520
Step 6: 3520 + 704 = 4224
Step 7: 4224 + 704 = 4928
Step 8: 4928 + 704 = 5632
Step 9: 5632 + 704 = 6336
Step 10: 6336 + 704 = 7040
Step 11: 7040 + 704 = 7744
Step 12: 7744 + 704 = 8448
Step 13: 8448 + 704 = 9152
Step 14: 9152 + 704 = 9856
Step 15: 9856 + 704 = 10560
Step 16: 10560 + 704 = 11264
Step 17: 11264 + 704 = 11968
Step 18: 11968 + 704 = 12672
Step 19: 12672 + 704 = 13376
Step 20: 13376 + 704 = 14080

So, 704*20 = 14080