OK, let's crack this. We're given 832 and our task is to multiply it by 25. Essentially, we'll be adding 832 to itself 25 times.
Step 1: 0 + 832 = 832
Step 2: 832 + 832 = 1664
Step 3: 1664 + 832 = 2496
Step 4: 2496 + 832 = 3328
Step 5: 3328 + 832 = 4160
Step 6: 4160 + 832 = 4992
Step 7: 4992 + 832 = 5824
Step 8: 5824 + 832 = 6656
Step 9: 6656 + 832 = 7488
Step 10: 7488 + 832 = 8320
Step 11: 8320 + 832 = 9152
Step 12: 9152 + 832 = 9984
Step 13: 9984 + 832 = 10816
Step 14: 10816 + 832 = 11648
Step 15: 11648 + 832 = 12480
Step 16: 12480 + 832 = 13312
Step 17: 13312 + 832 = 14144
Step 18: 14144 + 832 = 14976
Step 19: 14976 + 832 = 15808
Step 20: 15808 + 832 = 16640
Step 21: 16640 + 832 = 17472
Step 22: 17472 + 832 = 18304
Step 23: 18304 + 832 = 19136
Step 24: 19136 + 832 = 19968
Step 25: 19968 + 832 = 20800

So, 832*25 = 20800