Let's roll up our sleeves and solve this. We have 975 and we're going to multiply it by 31, essentially adding 975 to itself 31 times.
Step 1: 0 + 975 = 975
Step 2: 975 + 975 = 1950
Step 3: 1950 + 975 = 2925
Step 4: 2925 + 975 = 3900
Step 5: 3900 + 975 = 4875
Step 6: 4875 + 975 = 5850
Step 7: 5850 + 975 = 6825
Step 8: 6825 + 975 = 7800
Step 9: 7800 + 975 = 8775
Step 10: 8775 + 975 = 9750
Step 11: 9750 + 975 = 10725
Step 12: 10725 + 975 = 11700
Step 13: 11700 + 975 = 12675
Step 14: 12675 + 975 = 13650
Step 15: 13650 + 975 = 14625
Step 16: 14625 + 975 = 15600
Step 17: 15600 + 975 = 16575
Step 18: 16575 + 975 = 17550
Step 19: 17550 + 975 = 18525
Step 20: 18525 + 975 = 19500
Step 21: 19500 + 975 = 20475
Step 22: 20475 + 975 = 21450
Step 23: 21450 + 975 = 22425
Step 24: 22425 + 975 = 23400
Step 25: 23400 + 975 = 24375
Step 26: 24375 + 975 = 25350
Step 27: 25350 + 975 = 26325
Step 28: 26325 + 975 = 27300
Step 29: 27300 + 975 = 28275
Step 30: 28275 + 975 = 29250
Step 31: 29250 + 975 = 30225

So, 975*31 = 30225