Without delay, let's solve this. We've got 656 and we will be multiplying it by 25, that is, adding 656 to itself 25 times.
Step 1: 0 + 656 = 656
Step 2: 656 + 656 = 1312
Step 3: 1312 + 656 = 1968
Step 4: 1968 + 656 = 2624
Step 5: 2624 + 656 = 3280
Step 6: 3280 + 656 = 3936
Step 7: 3936 + 656 = 4592
Step 8: 4592 + 656 = 5248
Step 9: 5248 + 656 = 5904
Step 10: 5904 + 656 = 6560
Step 11: 6560 + 656 = 7216
Step 12: 7216 + 656 = 7872
Step 13: 7872 + 656 = 8528
Step 14: 8528 + 656 = 9184
Step 15: 9184 + 656 = 9840
Step 16: 9840 + 656 = 10496
Step 17: 10496 + 656 = 11152
Step 18: 11152 + 656 = 11808
Step 19: 11808 + 656 = 12464
Step 20: 12464 + 656 = 13120
Step 21: 13120 + 656 = 13776
Step 22: 13776 + 656 = 14432
Step 23: 14432 + 656 = 15088
Step 24: 15088 + 656 = 15744
Step 25: 15744 + 656 = 16400

So, 656*25 = 16400