OK, let's crack this. We're given 456 and our task is to multiply it by 56. Essentially, we'll be adding 456 to itself 56 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
Step 26: 11400 + 456 = 11856
Step 27: 11856 + 456 = 12312
Step 28: 12312 + 456 = 12768
Step 29: 12768 + 456 = 13224
Step 30: 13224 + 456 = 13680
Step 31: 13680 + 456 = 14136
Step 32: 14136 + 456 = 14592
Step 33: 14592 + 456 = 15048
Step 34: 15048 + 456 = 15504
Step 35: 15504 + 456 = 15960
Step 36: 15960 + 456 = 16416
Step 37: 16416 + 456 = 16872
Step 38: 16872 + 456 = 17328
Step 39: 17328 + 456 = 17784
Step 40: 17784 + 456 = 18240
Step 41: 18240 + 456 = 18696
Step 42: 18696 + 456 = 19152
Step 43: 19152 + 456 = 19608
Step 44: 19608 + 456 = 20064
Step 45: 20064 + 456 = 20520
Step 46: 20520 + 456 = 20976
Step 47: 20976 + 456 = 21432
Step 48: 21432 + 456 = 21888
Step 49: 21888 + 456 = 22344
Step 50: 22344 + 456 = 22800
Step 51: 22800 + 456 = 23256
Step 52: 23256 + 456 = 23712
Step 53: 23712 + 456 = 24168
Step 54: 24168 + 456 = 24624
Step 55: 24624 + 456 = 25080
Step 56: 25080 + 456 = 25536

So, 456*56 = 25536