Let's get this math done. We have 610 and we're going to multiply it by 31. This is the same as taking 610 and adding it to itself 31 times.
Step 1: 0 + 610 = 610
Step 2: 610 + 610 = 1220
Step 3: 1220 + 610 = 1830
Step 4: 1830 + 610 = 2440
Step 5: 2440 + 610 = 3050
Step 6: 3050 + 610 = 3660
Step 7: 3660 + 610 = 4270
Step 8: 4270 + 610 = 4880
Step 9: 4880 + 610 = 5490
Step 10: 5490 + 610 = 6100
Step 11: 6100 + 610 = 6710
Step 12: 6710 + 610 = 7320
Step 13: 7320 + 610 = 7930
Step 14: 7930 + 610 = 8540
Step 15: 8540 + 610 = 9150
Step 16: 9150 + 610 = 9760
Step 17: 9760 + 610 = 10370
Step 18: 10370 + 610 = 10980
Step 19: 10980 + 610 = 11590
Step 20: 11590 + 610 = 12200
Step 21: 12200 + 610 = 12810
Step 22: 12810 + 610 = 13420
Step 23: 13420 + 610 = 14030
Step 24: 14030 + 610 = 14640
Step 25: 14640 + 610 = 15250
Step 26: 15250 + 610 = 15860
Step 27: 15860 + 610 = 16470
Step 28: 16470 + 610 = 17080
Step 29: 17080 + 610 = 17690
Step 30: 17690 + 610 = 18300
Step 31: 18300 + 610 = 18910

So, 610*31 = 18910