OK, let's work through this together. We're starting with 88 and we're going to multiply it by 20, which means we add 88 to itself 20 times.
Step 1: 0 + 88 = 88
Step 2: 88 + 88 = 176
Step 3: 176 + 88 = 264
Step 4: 264 + 88 = 352
Step 5: 352 + 88 = 440
Step 6: 440 + 88 = 528
Step 7: 528 + 88 = 616
Step 8: 616 + 88 = 704
Step 9: 704 + 88 = 792
Step 10: 792 + 88 = 880
Step 11: 880 + 88 = 968
Step 12: 968 + 88 = 1056
Step 13: 1056 + 88 = 1144
Step 14: 1144 + 88 = 1232
Step 15: 1232 + 88 = 1320
Step 16: 1320 + 88 = 1408
Step 17: 1408 + 88 = 1496
Step 18: 1496 + 88 = 1584
Step 19: 1584 + 88 = 1672
Step 20: 1672 + 88 = 1760

So, 88*20 = 1760