OK, let's work through this together. We're starting with 609 and we're going to multiply it by 70, which means we add 609 to itself 70 times.
Step 1: 0 + 609 = 609
Step 2: 609 + 609 = 1218
Step 3: 1218 + 609 = 1827
Step 4: 1827 + 609 = 2436
Step 5: 2436 + 609 = 3045
Step 6: 3045 + 609 = 3654
Step 7: 3654 + 609 = 4263
Step 8: 4263 + 609 = 4872
Step 9: 4872 + 609 = 5481
Step 10: 5481 + 609 = 6090
Step 11: 6090 + 609 = 6699
Step 12: 6699 + 609 = 7308
Step 13: 7308 + 609 = 7917
Step 14: 7917 + 609 = 8526
Step 15: 8526 + 609 = 9135
Step 16: 9135 + 609 = 9744
Step 17: 9744 + 609 = 10353
Step 18: 10353 + 609 = 10962
Step 19: 10962 + 609 = 11571
Step 20: 11571 + 609 = 12180
Step 21: 12180 + 609 = 12789
Step 22: 12789 + 609 = 13398
Step 23: 13398 + 609 = 14007
Step 24: 14007 + 609 = 14616
Step 25: 14616 + 609 = 15225
Step 26: 15225 + 609 = 15834
Step 27: 15834 + 609 = 16443
Step 28: 16443 + 609 = 17052
Step 29: 17052 + 609 = 17661
Step 30: 17661 + 609 = 18270
Step 31: 18270 + 609 = 18879
Step 32: 18879 + 609 = 19488
Step 33: 19488 + 609 = 20097
Step 34: 20097 + 609 = 20706
Step 35: 20706 + 609 = 21315
Step 36: 21315 + 609 = 21924
Step 37: 21924 + 609 = 22533
Step 38: 22533 + 609 = 23142
Step 39: 23142 + 609 = 23751
Step 40: 23751 + 609 = 24360
Step 41: 24360 + 609 = 24969
Step 42: 24969 + 609 = 25578
Step 43: 25578 + 609 = 26187
Step 44: 26187 + 609 = 26796
Step 45: 26796 + 609 = 27405
Step 46: 27405 + 609 = 28014
Step 47: 28014 + 609 = 28623
Step 48: 28623 + 609 = 29232
Step 49: 29232 + 609 = 29841
Step 50: 29841 + 609 = 30450
Step 51: 30450 + 609 = 31059
Step 52: 31059 + 609 = 31668
Step 53: 31668 + 609 = 32277
Step 54: 32277 + 609 = 32886
Step 55: 32886 + 609 = 33495
Step 56: 33495 + 609 = 34104
Step 57: 34104 + 609 = 34713
Step 58: 34713 + 609 = 35322
Step 59: 35322 + 609 = 35931
Step 60: 35931 + 609 = 36540
Step 61: 36540 + 609 = 37149
Step 62: 37149 + 609 = 37758
Step 63: 37758 + 609 = 38367
Step 64: 38367 + 609 = 38976
Step 65: 38976 + 609 = 39585
Step 66: 39585 + 609 = 40194
Step 67: 40194 + 609 = 40803
Step 68: 40803 + 609 = 41412
Step 69: 41412 + 609 = 42021
Step 70: 42021 + 609 = 42630

So, 609*70 = 42630