Sure thing! We've got 328 and we're gonna multiply it by 91. That's the same as adding 328 to itself 91 times.
Step 1: 0 + 328 = 328
Step 2: 328 + 328 = 656
Step 3: 656 + 328 = 984
Step 4: 984 + 328 = 1312
Step 5: 1312 + 328 = 1640
Step 6: 1640 + 328 = 1968
Step 7: 1968 + 328 = 2296
Step 8: 2296 + 328 = 2624
Step 9: 2624 + 328 = 2952
Step 10: 2952 + 328 = 3280
Step 11: 3280 + 328 = 3608
Step 12: 3608 + 328 = 3936
Step 13: 3936 + 328 = 4264
Step 14: 4264 + 328 = 4592
Step 15: 4592 + 328 = 4920
Step 16: 4920 + 328 = 5248
Step 17: 5248 + 328 = 5576
Step 18: 5576 + 328 = 5904
Step 19: 5904 + 328 = 6232
Step 20: 6232 + 328 = 6560
Step 21: 6560 + 328 = 6888
Step 22: 6888 + 328 = 7216
Step 23: 7216 + 328 = 7544
Step 24: 7544 + 328 = 7872
Step 25: 7872 + 328 = 8200
Step 26: 8200 + 328 = 8528
Step 27: 8528 + 328 = 8856
Step 28: 8856 + 328 = 9184
Step 29: 9184 + 328 = 9512
Step 30: 9512 + 328 = 9840
Step 31: 9840 + 328 = 10168
Step 32: 10168 + 328 = 10496
Step 33: 10496 + 328 = 10824
Step 34: 10824 + 328 = 11152
Step 35: 11152 + 328 = 11480
Step 36: 11480 + 328 = 11808
Step 37: 11808 + 328 = 12136
Step 38: 12136 + 328 = 12464
Step 39: 12464 + 328 = 12792
Step 40: 12792 + 328 = 13120
Step 41: 13120 + 328 = 13448
Step 42: 13448 + 328 = 13776
Step 43: 13776 + 328 = 14104
Step 44: 14104 + 328 = 14432
Step 45: 14432 + 328 = 14760
Step 46: 14760 + 328 = 15088
Step 47: 15088 + 328 = 15416
Step 48: 15416 + 328 = 15744
Step 49: 15744 + 328 = 16072
Step 50: 16072 + 328 = 16400
Step 51: 16400 + 328 = 16728
Step 52: 16728 + 328 = 17056
Step 53: 17056 + 328 = 17384
Step 54: 17384 + 328 = 17712
Step 55: 17712 + 328 = 18040
Step 56: 18040 + 328 = 18368
Step 57: 18368 + 328 = 18696
Step 58: 18696 + 328 = 19024
Step 59: 19024 + 328 = 19352
Step 60: 19352 + 328 = 19680
Step 61: 19680 + 328 = 20008
Step 62: 20008 + 328 = 20336
Step 63: 20336 + 328 = 20664
Step 64: 20664 + 328 = 20992
Step 65: 20992 + 328 = 21320
Step 66: 21320 + 328 = 21648
Step 67: 21648 + 328 = 21976
Step 68: 21976 + 328 = 22304
Step 69: 22304 + 328 = 22632
Step 70: 22632 + 328 = 22960
Step 71: 22960 + 328 = 23288
Step 72: 23288 + 328 = 23616
Step 73: 23616 + 328 = 23944
Step 74: 23944 + 328 = 24272
Step 75: 24272 + 328 = 24600
Step 76: 24600 + 328 = 24928
Step 77: 24928 + 328 = 25256
Step 78: 25256 + 328 = 25584
Step 79: 25584 + 328 = 25912
Step 80: 25912 + 328 = 26240
Step 81: 26240 + 328 = 26568
Step 82: 26568 + 328 = 26896
Step 83: 26896 + 328 = 27224
Step 84: 27224 + 328 = 27552
Step 85: 27552 + 328 = 27880
Step 86: 27880 + 328 = 28208
Step 87: 28208 + 328 = 28536
Step 88: 28536 + 328 = 28864
Step 89: 28864 + 328 = 29192
Step 90: 29192 + 328 = 29520
Step 91: 29520 + 328 = 29848

So, 328*91 = 29848