OK, let's crack this. We're given 896 and our task is to multiply it by 31. Essentially, we'll be adding 896 to itself 31 times.
Step 1: 0 + 896 = 896
Step 2: 896 + 896 = 1792
Step 3: 1792 + 896 = 2688
Step 4: 2688 + 896 = 3584
Step 5: 3584 + 896 = 4480
Step 6: 4480 + 896 = 5376
Step 7: 5376 + 896 = 6272
Step 8: 6272 + 896 = 7168
Step 9: 7168 + 896 = 8064
Step 10: 8064 + 896 = 8960
Step 11: 8960 + 896 = 9856
Step 12: 9856 + 896 = 10752
Step 13: 10752 + 896 = 11648
Step 14: 11648 + 896 = 12544
Step 15: 12544 + 896 = 13440
Step 16: 13440 + 896 = 14336
Step 17: 14336 + 896 = 15232
Step 18: 15232 + 896 = 16128
Step 19: 16128 + 896 = 17024
Step 20: 17024 + 896 = 17920
Step 21: 17920 + 896 = 18816
Step 22: 18816 + 896 = 19712
Step 23: 19712 + 896 = 20608
Step 24: 20608 + 896 = 21504
Step 25: 21504 + 896 = 22400
Step 26: 22400 + 896 = 23296
Step 27: 23296 + 896 = 24192
Step 28: 24192 + 896 = 25088
Step 29: 25088 + 896 = 25984
Step 30: 25984 + 896 = 26880
Step 31: 26880 + 896 = 27776

So, 896*31 = 27776