Let's get this math done. We have 456 and we're going to multiply it by 25. This is the same as taking 456 and adding it to itself 25 times.
Step 1: 0 + 456 = 456
Step 2: 456 + 456 = 912
Step 3: 912 + 456 = 1368
Step 4: 1368 + 456 = 1824
Step 5: 1824 + 456 = 2280
Step 6: 2280 + 456 = 2736
Step 7: 2736 + 456 = 3192
Step 8: 3192 + 456 = 3648
Step 9: 3648 + 456 = 4104
Step 10: 4104 + 456 = 4560
Step 11: 4560 + 456 = 5016
Step 12: 5016 + 456 = 5472
Step 13: 5472 + 456 = 5928
Step 14: 5928 + 456 = 6384
Step 15: 6384 + 456 = 6840
Step 16: 6840 + 456 = 7296
Step 17: 7296 + 456 = 7752
Step 18: 7752 + 456 = 8208
Step 19: 8208 + 456 = 8664
Step 20: 8664 + 456 = 9120
Step 21: 9120 + 456 = 9576
Step 22: 9576 + 456 = 10032
Step 23: 10032 + 456 = 10488
Step 24: 10488 + 456 = 10944
Step 25: 10944 + 456 = 11400

So, 456*25 = 11400