Alright, let's solve this math problem step by step. First, we have the number 635. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 42. So, we're going to take the number 635 and add it to itself 42 times.
Step 1: 0 + 635 = 635
Step 2: 635 + 635 = 1270
Step 3: 1270 + 635 = 1905
Step 4: 1905 + 635 = 2540
Step 5: 2540 + 635 = 3175
Step 6: 3175 + 635 = 3810
Step 7: 3810 + 635 = 4445
Step 8: 4445 + 635 = 5080
Step 9: 5080 + 635 = 5715
Step 10: 5715 + 635 = 6350
Step 11: 6350 + 635 = 6985
Step 12: 6985 + 635 = 7620
Step 13: 7620 + 635 = 8255
Step 14: 8255 + 635 = 8890
Step 15: 8890 + 635 = 9525
Step 16: 9525 + 635 = 10160
Step 17: 10160 + 635 = 10795
Step 18: 10795 + 635 = 11430
Step 19: 11430 + 635 = 12065
Step 20: 12065 + 635 = 12700
Step 21: 12700 + 635 = 13335
Step 22: 13335 + 635 = 13970
Step 23: 13970 + 635 = 14605
Step 24: 14605 + 635 = 15240
Step 25: 15240 + 635 = 15875
Step 26: 15875 + 635 = 16510
Step 27: 16510 + 635 = 17145
Step 28: 17145 + 635 = 17780
Step 29: 17780 + 635 = 18415
Step 30: 18415 + 635 = 19050
Step 31: 19050 + 635 = 19685
Step 32: 19685 + 635 = 20320
Step 33: 20320 + 635 = 20955
Step 34: 20955 + 635 = 21590
Step 35: 21590 + 635 = 22225
Step 36: 22225 + 635 = 22860
Step 37: 22860 + 635 = 23495
Step 38: 23495 + 635 = 24130
Step 39: 24130 + 635 = 24765
Step 40: 24765 + 635 = 25400
Step 41: 25400 + 635 = 26035
Step 42: 26035 + 635 = 26670

So, 635*42 = 26670