Without delay, let's solve this. We've got 402 and we will be multiplying it by 45, that is, adding 402 to itself 45 times.
Step 1: 0 + 402 = 402
Step 2: 402 + 402 = 804
Step 3: 804 + 402 = 1206
Step 4: 1206 + 402 = 1608
Step 5: 1608 + 402 = 2010
Step 6: 2010 + 402 = 2412
Step 7: 2412 + 402 = 2814
Step 8: 2814 + 402 = 3216
Step 9: 3216 + 402 = 3618
Step 10: 3618 + 402 = 4020
Step 11: 4020 + 402 = 4422
Step 12: 4422 + 402 = 4824
Step 13: 4824 + 402 = 5226
Step 14: 5226 + 402 = 5628
Step 15: 5628 + 402 = 6030
Step 16: 6030 + 402 = 6432
Step 17: 6432 + 402 = 6834
Step 18: 6834 + 402 = 7236
Step 19: 7236 + 402 = 7638
Step 20: 7638 + 402 = 8040
Step 21: 8040 + 402 = 8442
Step 22: 8442 + 402 = 8844
Step 23: 8844 + 402 = 9246
Step 24: 9246 + 402 = 9648
Step 25: 9648 + 402 = 10050
Step 26: 10050 + 402 = 10452
Step 27: 10452 + 402 = 10854
Step 28: 10854 + 402 = 11256
Step 29: 11256 + 402 = 11658
Step 30: 11658 + 402 = 12060
Step 31: 12060 + 402 = 12462
Step 32: 12462 + 402 = 12864
Step 33: 12864 + 402 = 13266
Step 34: 13266 + 402 = 13668
Step 35: 13668 + 402 = 14070
Step 36: 14070 + 402 = 14472
Step 37: 14472 + 402 = 14874
Step 38: 14874 + 402 = 15276
Step 39: 15276 + 402 = 15678
Step 40: 15678 + 402 = 16080
Step 41: 16080 + 402 = 16482
Step 42: 16482 + 402 = 16884
Step 43: 16884 + 402 = 17286
Step 44: 17286 + 402 = 17688
Step 45: 17688 + 402 = 18090

So, 402*45 = 18090