Let's roll up our sleeves and solve this. We have 959 and we're going to multiply it by 25, essentially adding 959 to itself 25 times.
Step 1: 0 + 959 = 959
Step 2: 959 + 959 = 1918
Step 3: 1918 + 959 = 2877
Step 4: 2877 + 959 = 3836
Step 5: 3836 + 959 = 4795
Step 6: 4795 + 959 = 5754
Step 7: 5754 + 959 = 6713
Step 8: 6713 + 959 = 7672
Step 9: 7672 + 959 = 8631
Step 10: 8631 + 959 = 9590
Step 11: 9590 + 959 = 10549
Step 12: 10549 + 959 = 11508
Step 13: 11508 + 959 = 12467
Step 14: 12467 + 959 = 13426
Step 15: 13426 + 959 = 14385
Step 16: 14385 + 959 = 15344
Step 17: 15344 + 959 = 16303
Step 18: 16303 + 959 = 17262
Step 19: 17262 + 959 = 18221
Step 20: 18221 + 959 = 19180
Step 21: 19180 + 959 = 20139
Step 22: 20139 + 959 = 21098
Step 23: 21098 + 959 = 22057
Step 24: 22057 + 959 = 23016
Step 25: 23016 + 959 = 23975

So, 959*25 = 23975