Alright, let's solve this math problem step by step. First, we have the number 735. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 28. So, we're going to take the number 735 and add it to itself 28 times.
Step 1: 0 + 735 = 735
Step 2: 735 + 735 = 1470
Step 3: 1470 + 735 = 2205
Step 4: 2205 + 735 = 2940
Step 5: 2940 + 735 = 3675
Step 6: 3675 + 735 = 4410
Step 7: 4410 + 735 = 5145
Step 8: 5145 + 735 = 5880
Step 9: 5880 + 735 = 6615
Step 10: 6615 + 735 = 7350
Step 11: 7350 + 735 = 8085
Step 12: 8085 + 735 = 8820
Step 13: 8820 + 735 = 9555
Step 14: 9555 + 735 = 10290
Step 15: 10290 + 735 = 11025
Step 16: 11025 + 735 = 11760
Step 17: 11760 + 735 = 12495
Step 18: 12495 + 735 = 13230
Step 19: 13230 + 735 = 13965
Step 20: 13965 + 735 = 14700
Step 21: 14700 + 735 = 15435
Step 22: 15435 + 735 = 16170
Step 23: 16170 + 735 = 16905
Step 24: 16905 + 735 = 17640
Step 25: 17640 + 735 = 18375
Step 26: 18375 + 735 = 19110
Step 27: 19110 + 735 = 19845
Step 28: 19845 + 735 = 20580

So, 735*28 = 20580