Let's get this math done. We have 440 and we're going to multiply it by 31. This is the same as taking 440 and adding it to itself 31 times.
Step 1: 0 + 440 = 440
Step 2: 440 + 440 = 880
Step 3: 880 + 440 = 1320
Step 4: 1320 + 440 = 1760
Step 5: 1760 + 440 = 2200
Step 6: 2200 + 440 = 2640
Step 7: 2640 + 440 = 3080
Step 8: 3080 + 440 = 3520
Step 9: 3520 + 440 = 3960
Step 10: 3960 + 440 = 4400
Step 11: 4400 + 440 = 4840
Step 12: 4840 + 440 = 5280
Step 13: 5280 + 440 = 5720
Step 14: 5720 + 440 = 6160
Step 15: 6160 + 440 = 6600
Step 16: 6600 + 440 = 7040
Step 17: 7040 + 440 = 7480
Step 18: 7480 + 440 = 7920
Step 19: 7920 + 440 = 8360
Step 20: 8360 + 440 = 8800
Step 21: 8800 + 440 = 9240
Step 22: 9240 + 440 = 9680
Step 23: 9680 + 440 = 10120
Step 24: 10120 + 440 = 10560
Step 25: 10560 + 440 = 11000
Step 26: 11000 + 440 = 11440
Step 27: 11440 + 440 = 11880
Step 28: 11880 + 440 = 12320
Step 29: 12320 + 440 = 12760
Step 30: 12760 + 440 = 13200
Step 31: 13200 + 440 = 13640

So, 440*31 = 13640