Let's get this math done. We have 7 and we're going to multiply it by 20. This is the same as taking 7 and adding it to itself 20 times.
Step 1: 0 + 7 = 7
Step 2: 7 + 7 = 14
Step 3: 14 + 7 = 21
Step 4: 21 + 7 = 28
Step 5: 28 + 7 = 35
Step 6: 35 + 7 = 42
Step 7: 42 + 7 = 49
Step 8: 49 + 7 = 56
Step 9: 56 + 7 = 63
Step 10: 63 + 7 = 70
Step 11: 70 + 7 = 77
Step 12: 77 + 7 = 84
Step 13: 84 + 7 = 91
Step 14: 91 + 7 = 98
Step 15: 98 + 7 = 105
Step 16: 105 + 7 = 112
Step 17: 112 + 7 = 119
Step 18: 119 + 7 = 126
Step 19: 126 + 7 = 133
Step 20: 133 + 7 = 140

So, 7*20 = 140