OK, let's work through this together. We're starting with 35 and we're going to multiply it by 20, which means we add 35 to itself 20 times.
Step 1: 0 + 35 = 35
Step 2: 35 + 35 = 70
Step 3: 70 + 35 = 105
Step 4: 105 + 35 = 140
Step 5: 140 + 35 = 175
Step 6: 175 + 35 = 210
Step 7: 210 + 35 = 245
Step 8: 245 + 35 = 280
Step 9: 280 + 35 = 315
Step 10: 315 + 35 = 350
Step 11: 350 + 35 = 385
Step 12: 385 + 35 = 420
Step 13: 420 + 35 = 455
Step 14: 455 + 35 = 490
Step 15: 490 + 35 = 525
Step 16: 525 + 35 = 560
Step 17: 560 + 35 = 595
Step 18: 595 + 35 = 630
Step 19: 630 + 35 = 665
Step 20: 665 + 35 = 700

So, 35*20 = 700