Let's roll up our sleeves and solve this. We have 260 and we're going to multiply it by 25, essentially adding 260 to itself 25 times.
Step 1: 0 + 260 = 260
Step 2: 260 + 260 = 520
Step 3: 520 + 260 = 780
Step 4: 780 + 260 = 1040
Step 5: 1040 + 260 = 1300
Step 6: 1300 + 260 = 1560
Step 7: 1560 + 260 = 1820
Step 8: 1820 + 260 = 2080
Step 9: 2080 + 260 = 2340
Step 10: 2340 + 260 = 2600
Step 11: 2600 + 260 = 2860
Step 12: 2860 + 260 = 3120
Step 13: 3120 + 260 = 3380
Step 14: 3380 + 260 = 3640
Step 15: 3640 + 260 = 3900
Step 16: 3900 + 260 = 4160
Step 17: 4160 + 260 = 4420
Step 18: 4420 + 260 = 4680
Step 19: 4680 + 260 = 4940
Step 20: 4940 + 260 = 5200
Step 21: 5200 + 260 = 5460
Step 22: 5460 + 260 = 5720
Step 23: 5720 + 260 = 5980
Step 24: 5980 + 260 = 6240
Step 25: 6240 + 260 = 6500

So, 260*25 = 6500