Sure thing, let's get straight to it. We start with 16 and we're going to multiply it by 80, which means adding 16 to itself 80 times.
Step 1: 0 + 16 = 16
Step 2: 16 + 16 = 32
Step 3: 32 + 16 = 48
Step 4: 48 + 16 = 64
Step 5: 64 + 16 = 80
Step 6: 80 + 16 = 96
Step 7: 96 + 16 = 112
Step 8: 112 + 16 = 128
Step 9: 128 + 16 = 144
Step 10: 144 + 16 = 160
Step 11: 160 + 16 = 176
Step 12: 176 + 16 = 192
Step 13: 192 + 16 = 208
Step 14: 208 + 16 = 224
Step 15: 224 + 16 = 240
Step 16: 240 + 16 = 256
Step 17: 256 + 16 = 272
Step 18: 272 + 16 = 288
Step 19: 288 + 16 = 304
Step 20: 304 + 16 = 320
Step 21: 320 + 16 = 336
Step 22: 336 + 16 = 352
Step 23: 352 + 16 = 368
Step 24: 368 + 16 = 384
Step 25: 384 + 16 = 400
Step 26: 400 + 16 = 416
Step 27: 416 + 16 = 432
Step 28: 432 + 16 = 448
Step 29: 448 + 16 = 464
Step 30: 464 + 16 = 480
Step 31: 480 + 16 = 496
Step 32: 496 + 16 = 512
Step 33: 512 + 16 = 528
Step 34: 528 + 16 = 544
Step 35: 544 + 16 = 560
Step 36: 560 + 16 = 576
Step 37: 576 + 16 = 592
Step 38: 592 + 16 = 608
Step 39: 608 + 16 = 624
Step 40: 624 + 16 = 640
Step 41: 640 + 16 = 656
Step 42: 656 + 16 = 672
Step 43: 672 + 16 = 688
Step 44: 688 + 16 = 704
Step 45: 704 + 16 = 720
Step 46: 720 + 16 = 736
Step 47: 736 + 16 = 752
Step 48: 752 + 16 = 768
Step 49: 768 + 16 = 784
Step 50: 784 + 16 = 800
Step 51: 800 + 16 = 816
Step 52: 816 + 16 = 832
Step 53: 832 + 16 = 848
Step 54: 848 + 16 = 864
Step 55: 864 + 16 = 880
Step 56: 880 + 16 = 896
Step 57: 896 + 16 = 912
Step 58: 912 + 16 = 928
Step 59: 928 + 16 = 944
Step 60: 944 + 16 = 960
Step 61: 960 + 16 = 976
Step 62: 976 + 16 = 992
Step 63: 992 + 16 = 1008
Step 64: 1008 + 16 = 1024
Step 65: 1024 + 16 = 1040
Step 66: 1040 + 16 = 1056
Step 67: 1056 + 16 = 1072
Step 68: 1072 + 16 = 1088
Step 69: 1088 + 16 = 1104
Step 70: 1104 + 16 = 1120
Step 71: 1120 + 16 = 1136
Step 72: 1136 + 16 = 1152
Step 73: 1152 + 16 = 1168
Step 74: 1168 + 16 = 1184
Step 75: 1184 + 16 = 1200
Step 76: 1200 + 16 = 1216
Step 77: 1216 + 16 = 1232
Step 78: 1232 + 16 = 1248
Step 79: 1248 + 16 = 1264
Step 80: 1264 + 16 = 1280

So, 16*80 = 1280