Alright, let's solve this math problem step by step. First, we have the number 145. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 25. So, we're going to take the number 145 and add it to itself 25 times.
Step 1: 0 + 145 = 145
Step 2: 145 + 145 = 290
Step 3: 290 + 145 = 435
Step 4: 435 + 145 = 580
Step 5: 580 + 145 = 725
Step 6: 725 + 145 = 870
Step 7: 870 + 145 = 1015
Step 8: 1015 + 145 = 1160
Step 9: 1160 + 145 = 1305
Step 10: 1305 + 145 = 1450
Step 11: 1450 + 145 = 1595
Step 12: 1595 + 145 = 1740
Step 13: 1740 + 145 = 1885
Step 14: 1885 + 145 = 2030
Step 15: 2030 + 145 = 2175
Step 16: 2175 + 145 = 2320
Step 17: 2320 + 145 = 2465
Step 18: 2465 + 145 = 2610
Step 19: 2610 + 145 = 2755
Step 20: 2755 + 145 = 2900
Step 21: 2900 + 145 = 3045
Step 22: 3045 + 145 = 3190
Step 23: 3190 + 145 = 3335
Step 24: 3335 + 145 = 3480
Step 25: 3480 + 145 = 3625

So, 145*25 = 3625