Alright, let's solve this math problem step by step. First, we have the number 424. 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 424 and add it to itself 25 times.
Step 1: 0 + 424 = 424
Step 2: 424 + 424 = 848
Step 3: 848 + 424 = 1272
Step 4: 1272 + 424 = 1696
Step 5: 1696 + 424 = 2120
Step 6: 2120 + 424 = 2544
Step 7: 2544 + 424 = 2968
Step 8: 2968 + 424 = 3392
Step 9: 3392 + 424 = 3816
Step 10: 3816 + 424 = 4240
Step 11: 4240 + 424 = 4664
Step 12: 4664 + 424 = 5088
Step 13: 5088 + 424 = 5512
Step 14: 5512 + 424 = 5936
Step 15: 5936 + 424 = 6360
Step 16: 6360 + 424 = 6784
Step 17: 6784 + 424 = 7208
Step 18: 7208 + 424 = 7632
Step 19: 7632 + 424 = 8056
Step 20: 8056 + 424 = 8480
Step 21: 8480 + 424 = 8904
Step 22: 8904 + 424 = 9328
Step 23: 9328 + 424 = 9752
Step 24: 9752 + 424 = 10176
Step 25: 10176 + 424 = 10600

So, 424*25 = 10600