Without delay, let's solve this. We've got 64 and we will be multiplying it by 86, that is, adding 64 to itself 86 times.
Step 1: 0 + 64 = 64
Step 2: 64 + 64 = 128
Step 3: 128 + 64 = 192
Step 4: 192 + 64 = 256
Step 5: 256 + 64 = 320
Step 6: 320 + 64 = 384
Step 7: 384 + 64 = 448
Step 8: 448 + 64 = 512
Step 9: 512 + 64 = 576
Step 10: 576 + 64 = 640
Step 11: 640 + 64 = 704
Step 12: 704 + 64 = 768
Step 13: 768 + 64 = 832
Step 14: 832 + 64 = 896
Step 15: 896 + 64 = 960
Step 16: 960 + 64 = 1024
Step 17: 1024 + 64 = 1088
Step 18: 1088 + 64 = 1152
Step 19: 1152 + 64 = 1216
Step 20: 1216 + 64 = 1280
Step 21: 1280 + 64 = 1344
Step 22: 1344 + 64 = 1408
Step 23: 1408 + 64 = 1472
Step 24: 1472 + 64 = 1536
Step 25: 1536 + 64 = 1600
Step 26: 1600 + 64 = 1664
Step 27: 1664 + 64 = 1728
Step 28: 1728 + 64 = 1792
Step 29: 1792 + 64 = 1856
Step 30: 1856 + 64 = 1920
Step 31: 1920 + 64 = 1984
Step 32: 1984 + 64 = 2048
Step 33: 2048 + 64 = 2112
Step 34: 2112 + 64 = 2176
Step 35: 2176 + 64 = 2240
Step 36: 2240 + 64 = 2304
Step 37: 2304 + 64 = 2368
Step 38: 2368 + 64 = 2432
Step 39: 2432 + 64 = 2496
Step 40: 2496 + 64 = 2560
Step 41: 2560 + 64 = 2624
Step 42: 2624 + 64 = 2688
Step 43: 2688 + 64 = 2752
Step 44: 2752 + 64 = 2816
Step 45: 2816 + 64 = 2880
Step 46: 2880 + 64 = 2944
Step 47: 2944 + 64 = 3008
Step 48: 3008 + 64 = 3072
Step 49: 3072 + 64 = 3136
Step 50: 3136 + 64 = 3200
Step 51: 3200 + 64 = 3264
Step 52: 3264 + 64 = 3328
Step 53: 3328 + 64 = 3392
Step 54: 3392 + 64 = 3456
Step 55: 3456 + 64 = 3520
Step 56: 3520 + 64 = 3584
Step 57: 3584 + 64 = 3648
Step 58: 3648 + 64 = 3712
Step 59: 3712 + 64 = 3776
Step 60: 3776 + 64 = 3840
Step 61: 3840 + 64 = 3904
Step 62: 3904 + 64 = 3968
Step 63: 3968 + 64 = 4032
Step 64: 4032 + 64 = 4096
Step 65: 4096 + 64 = 4160
Step 66: 4160 + 64 = 4224
Step 67: 4224 + 64 = 4288
Step 68: 4288 + 64 = 4352
Step 69: 4352 + 64 = 4416
Step 70: 4416 + 64 = 4480
Step 71: 4480 + 64 = 4544
Step 72: 4544 + 64 = 4608
Step 73: 4608 + 64 = 4672
Step 74: 4672 + 64 = 4736
Step 75: 4736 + 64 = 4800
Step 76: 4800 + 64 = 4864
Step 77: 4864 + 64 = 4928
Step 78: 4928 + 64 = 4992
Step 79: 4992 + 64 = 5056
Step 80: 5056 + 64 = 5120
Step 81: 5120 + 64 = 5184
Step 82: 5184 + 64 = 5248
Step 83: 5248 + 64 = 5312
Step 84: 5312 + 64 = 5376
Step 85: 5376 + 64 = 5440
Step 86: 5440 + 64 = 5504

So, 64*86 = 5504