Alright, let's solve this math problem step by step. First, we have the number 402. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 40. So, we're going to take the number 402 and add it to itself 40 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

So, 402*40 = 16080