Without delay, let's solve this. We've got 124 and we will be multiplying it by 25, that is, adding 124 to itself 25 times.
Step 1: 0 + 124 = 124
Step 2: 124 + 124 = 248
Step 3: 248 + 124 = 372
Step 4: 372 + 124 = 496
Step 5: 496 + 124 = 620
Step 6: 620 + 124 = 744
Step 7: 744 + 124 = 868
Step 8: 868 + 124 = 992
Step 9: 992 + 124 = 1116
Step 10: 1116 + 124 = 1240
Step 11: 1240 + 124 = 1364
Step 12: 1364 + 124 = 1488
Step 13: 1488 + 124 = 1612
Step 14: 1612 + 124 = 1736
Step 15: 1736 + 124 = 1860
Step 16: 1860 + 124 = 1984
Step 17: 1984 + 124 = 2108
Step 18: 2108 + 124 = 2232
Step 19: 2232 + 124 = 2356
Step 20: 2356 + 124 = 2480
Step 21: 2480 + 124 = 2604
Step 22: 2604 + 124 = 2728
Step 23: 2728 + 124 = 2852
Step 24: 2852 + 124 = 2976
Step 25: 2976 + 124 = 3100

So, 124*25 = 3100