Let's get this math done. We have 217 and we're going to multiply it by 81. This is the same as taking 217 and adding it to itself 81 times.
Step 1: 0 + 217 = 217
Step 2: 217 + 217 = 434
Step 3: 434 + 217 = 651
Step 4: 651 + 217 = 868
Step 5: 868 + 217 = 1085
Step 6: 1085 + 217 = 1302
Step 7: 1302 + 217 = 1519
Step 8: 1519 + 217 = 1736
Step 9: 1736 + 217 = 1953
Step 10: 1953 + 217 = 2170
Step 11: 2170 + 217 = 2387
Step 12: 2387 + 217 = 2604
Step 13: 2604 + 217 = 2821
Step 14: 2821 + 217 = 3038
Step 15: 3038 + 217 = 3255
Step 16: 3255 + 217 = 3472
Step 17: 3472 + 217 = 3689
Step 18: 3689 + 217 = 3906
Step 19: 3906 + 217 = 4123
Step 20: 4123 + 217 = 4340
Step 21: 4340 + 217 = 4557
Step 22: 4557 + 217 = 4774
Step 23: 4774 + 217 = 4991
Step 24: 4991 + 217 = 5208
Step 25: 5208 + 217 = 5425
Step 26: 5425 + 217 = 5642
Step 27: 5642 + 217 = 5859
Step 28: 5859 + 217 = 6076
Step 29: 6076 + 217 = 6293
Step 30: 6293 + 217 = 6510
Step 31: 6510 + 217 = 6727
Step 32: 6727 + 217 = 6944
Step 33: 6944 + 217 = 7161
Step 34: 7161 + 217 = 7378
Step 35: 7378 + 217 = 7595
Step 36: 7595 + 217 = 7812
Step 37: 7812 + 217 = 8029
Step 38: 8029 + 217 = 8246
Step 39: 8246 + 217 = 8463
Step 40: 8463 + 217 = 8680
Step 41: 8680 + 217 = 8897
Step 42: 8897 + 217 = 9114
Step 43: 9114 + 217 = 9331
Step 44: 9331 + 217 = 9548
Step 45: 9548 + 217 = 9765
Step 46: 9765 + 217 = 9982
Step 47: 9982 + 217 = 10199
Step 48: 10199 + 217 = 10416
Step 49: 10416 + 217 = 10633
Step 50: 10633 + 217 = 10850
Step 51: 10850 + 217 = 11067
Step 52: 11067 + 217 = 11284
Step 53: 11284 + 217 = 11501
Step 54: 11501 + 217 = 11718
Step 55: 11718 + 217 = 11935
Step 56: 11935 + 217 = 12152
Step 57: 12152 + 217 = 12369
Step 58: 12369 + 217 = 12586
Step 59: 12586 + 217 = 12803
Step 60: 12803 + 217 = 13020
Step 61: 13020 + 217 = 13237
Step 62: 13237 + 217 = 13454
Step 63: 13454 + 217 = 13671
Step 64: 13671 + 217 = 13888
Step 65: 13888 + 217 = 14105
Step 66: 14105 + 217 = 14322
Step 67: 14322 + 217 = 14539
Step 68: 14539 + 217 = 14756
Step 69: 14756 + 217 = 14973
Step 70: 14973 + 217 = 15190
Step 71: 15190 + 217 = 15407
Step 72: 15407 + 217 = 15624
Step 73: 15624 + 217 = 15841
Step 74: 15841 + 217 = 16058
Step 75: 16058 + 217 = 16275
Step 76: 16275 + 217 = 16492
Step 77: 16492 + 217 = 16709
Step 78: 16709 + 217 = 16926
Step 79: 16926 + 217 = 17143
Step 80: 17143 + 217 = 17360
Step 81: 17360 + 217 = 17577

So, 217*81 = 17577