Let's get this math done. We have 248 and we're going to multiply it by 81. This is the same as taking 248 and adding it to itself 81 times.
Step 1: 0 + 248 = 248
Step 2: 248 + 248 = 496
Step 3: 496 + 248 = 744
Step 4: 744 + 248 = 992
Step 5: 992 + 248 = 1240
Step 6: 1240 + 248 = 1488
Step 7: 1488 + 248 = 1736
Step 8: 1736 + 248 = 1984
Step 9: 1984 + 248 = 2232
Step 10: 2232 + 248 = 2480
Step 11: 2480 + 248 = 2728
Step 12: 2728 + 248 = 2976
Step 13: 2976 + 248 = 3224
Step 14: 3224 + 248 = 3472
Step 15: 3472 + 248 = 3720
Step 16: 3720 + 248 = 3968
Step 17: 3968 + 248 = 4216
Step 18: 4216 + 248 = 4464
Step 19: 4464 + 248 = 4712
Step 20: 4712 + 248 = 4960
Step 21: 4960 + 248 = 5208
Step 22: 5208 + 248 = 5456
Step 23: 5456 + 248 = 5704
Step 24: 5704 + 248 = 5952
Step 25: 5952 + 248 = 6200
Step 26: 6200 + 248 = 6448
Step 27: 6448 + 248 = 6696
Step 28: 6696 + 248 = 6944
Step 29: 6944 + 248 = 7192
Step 30: 7192 + 248 = 7440
Step 31: 7440 + 248 = 7688
Step 32: 7688 + 248 = 7936
Step 33: 7936 + 248 = 8184
Step 34: 8184 + 248 = 8432
Step 35: 8432 + 248 = 8680
Step 36: 8680 + 248 = 8928
Step 37: 8928 + 248 = 9176
Step 38: 9176 + 248 = 9424
Step 39: 9424 + 248 = 9672
Step 40: 9672 + 248 = 9920
Step 41: 9920 + 248 = 10168
Step 42: 10168 + 248 = 10416
Step 43: 10416 + 248 = 10664
Step 44: 10664 + 248 = 10912
Step 45: 10912 + 248 = 11160
Step 46: 11160 + 248 = 11408
Step 47: 11408 + 248 = 11656
Step 48: 11656 + 248 = 11904
Step 49: 11904 + 248 = 12152
Step 50: 12152 + 248 = 12400
Step 51: 12400 + 248 = 12648
Step 52: 12648 + 248 = 12896
Step 53: 12896 + 248 = 13144
Step 54: 13144 + 248 = 13392
Step 55: 13392 + 248 = 13640
Step 56: 13640 + 248 = 13888
Step 57: 13888 + 248 = 14136
Step 58: 14136 + 248 = 14384
Step 59: 14384 + 248 = 14632
Step 60: 14632 + 248 = 14880
Step 61: 14880 + 248 = 15128
Step 62: 15128 + 248 = 15376
Step 63: 15376 + 248 = 15624
Step 64: 15624 + 248 = 15872
Step 65: 15872 + 248 = 16120
Step 66: 16120 + 248 = 16368
Step 67: 16368 + 248 = 16616
Step 68: 16616 + 248 = 16864
Step 69: 16864 + 248 = 17112
Step 70: 17112 + 248 = 17360
Step 71: 17360 + 248 = 17608
Step 72: 17608 + 248 = 17856
Step 73: 17856 + 248 = 18104
Step 74: 18104 + 248 = 18352
Step 75: 18352 + 248 = 18600
Step 76: 18600 + 248 = 18848
Step 77: 18848 + 248 = 19096
Step 78: 19096 + 248 = 19344
Step 79: 19344 + 248 = 19592
Step 80: 19592 + 248 = 19840
Step 81: 19840 + 248 = 20088

So, 248*81 = 20088