OK, let's crack this. We're given 316 and our task is to multiply it by 99. Essentially, we'll be adding 316 to itself 99 times.
Step 1: 0 + 316 = 316
Step 2: 316 + 316 = 632
Step 3: 632 + 316 = 948
Step 4: 948 + 316 = 1264
Step 5: 1264 + 316 = 1580
Step 6: 1580 + 316 = 1896
Step 7: 1896 + 316 = 2212
Step 8: 2212 + 316 = 2528
Step 9: 2528 + 316 = 2844
Step 10: 2844 + 316 = 3160
Step 11: 3160 + 316 = 3476
Step 12: 3476 + 316 = 3792
Step 13: 3792 + 316 = 4108
Step 14: 4108 + 316 = 4424
Step 15: 4424 + 316 = 4740
Step 16: 4740 + 316 = 5056
Step 17: 5056 + 316 = 5372
Step 18: 5372 + 316 = 5688
Step 19: 5688 + 316 = 6004
Step 20: 6004 + 316 = 6320
Step 21: 6320 + 316 = 6636
Step 22: 6636 + 316 = 6952
Step 23: 6952 + 316 = 7268
Step 24: 7268 + 316 = 7584
Step 25: 7584 + 316 = 7900
Step 26: 7900 + 316 = 8216
Step 27: 8216 + 316 = 8532
Step 28: 8532 + 316 = 8848
Step 29: 8848 + 316 = 9164
Step 30: 9164 + 316 = 9480
Step 31: 9480 + 316 = 9796
Step 32: 9796 + 316 = 10112
Step 33: 10112 + 316 = 10428
Step 34: 10428 + 316 = 10744
Step 35: 10744 + 316 = 11060
Step 36: 11060 + 316 = 11376
Step 37: 11376 + 316 = 11692
Step 38: 11692 + 316 = 12008
Step 39: 12008 + 316 = 12324
Step 40: 12324 + 316 = 12640
Step 41: 12640 + 316 = 12956
Step 42: 12956 + 316 = 13272
Step 43: 13272 + 316 = 13588
Step 44: 13588 + 316 = 13904
Step 45: 13904 + 316 = 14220
Step 46: 14220 + 316 = 14536
Step 47: 14536 + 316 = 14852
Step 48: 14852 + 316 = 15168
Step 49: 15168 + 316 = 15484
Step 50: 15484 + 316 = 15800
Step 51: 15800 + 316 = 16116
Step 52: 16116 + 316 = 16432
Step 53: 16432 + 316 = 16748
Step 54: 16748 + 316 = 17064
Step 55: 17064 + 316 = 17380
Step 56: 17380 + 316 = 17696
Step 57: 17696 + 316 = 18012
Step 58: 18012 + 316 = 18328
Step 59: 18328 + 316 = 18644
Step 60: 18644 + 316 = 18960
Step 61: 18960 + 316 = 19276
Step 62: 19276 + 316 = 19592
Step 63: 19592 + 316 = 19908
Step 64: 19908 + 316 = 20224
Step 65: 20224 + 316 = 20540
Step 66: 20540 + 316 = 20856
Step 67: 20856 + 316 = 21172
Step 68: 21172 + 316 = 21488
Step 69: 21488 + 316 = 21804
Step 70: 21804 + 316 = 22120
Step 71: 22120 + 316 = 22436
Step 72: 22436 + 316 = 22752
Step 73: 22752 + 316 = 23068
Step 74: 23068 + 316 = 23384
Step 75: 23384 + 316 = 23700
Step 76: 23700 + 316 = 24016
Step 77: 24016 + 316 = 24332
Step 78: 24332 + 316 = 24648
Step 79: 24648 + 316 = 24964
Step 80: 24964 + 316 = 25280
Step 81: 25280 + 316 = 25596
Step 82: 25596 + 316 = 25912
Step 83: 25912 + 316 = 26228
Step 84: 26228 + 316 = 26544
Step 85: 26544 + 316 = 26860
Step 86: 26860 + 316 = 27176
Step 87: 27176 + 316 = 27492
Step 88: 27492 + 316 = 27808
Step 89: 27808 + 316 = 28124
Step 90: 28124 + 316 = 28440
Step 91: 28440 + 316 = 28756
Step 92: 28756 + 316 = 29072
Step 93: 29072 + 316 = 29388
Step 94: 29388 + 316 = 29704
Step 95: 29704 + 316 = 30020
Step 96: 30020 + 316 = 30336
Step 97: 30336 + 316 = 30652
Step 98: 30652 + 316 = 30968
Step 99: 30968 + 316 = 31284

So, 316*99 = 31284