Let's get this math done. We have 827 and we're going to multiply it by 25. This is the same as taking 827 and adding it to itself 25 times.
Step 1: 0 + 827 = 827
Step 2: 827 + 827 = 1654
Step 3: 1654 + 827 = 2481
Step 4: 2481 + 827 = 3308
Step 5: 3308 + 827 = 4135
Step 6: 4135 + 827 = 4962
Step 7: 4962 + 827 = 5789
Step 8: 5789 + 827 = 6616
Step 9: 6616 + 827 = 7443
Step 10: 7443 + 827 = 8270
Step 11: 8270 + 827 = 9097
Step 12: 9097 + 827 = 9924
Step 13: 9924 + 827 = 10751
Step 14: 10751 + 827 = 11578
Step 15: 11578 + 827 = 12405
Step 16: 12405 + 827 = 13232
Step 17: 13232 + 827 = 14059
Step 18: 14059 + 827 = 14886
Step 19: 14886 + 827 = 15713
Step 20: 15713 + 827 = 16540
Step 21: 16540 + 827 = 17367
Step 22: 17367 + 827 = 18194
Step 23: 18194 + 827 = 19021
Step 24: 19021 + 827 = 19848
Step 25: 19848 + 827 = 20675

So, 827*25 = 20675