Let's roll up our sleeves and solve this. We have 157 and we're going to multiply it by 41, essentially adding 157 to itself 41 times.
Step 1: 0 + 157 = 157
Step 2: 157 + 157 = 314
Step 3: 314 + 157 = 471
Step 4: 471 + 157 = 628
Step 5: 628 + 157 = 785
Step 6: 785 + 157 = 942
Step 7: 942 + 157 = 1099
Step 8: 1099 + 157 = 1256
Step 9: 1256 + 157 = 1413
Step 10: 1413 + 157 = 1570
Step 11: 1570 + 157 = 1727
Step 12: 1727 + 157 = 1884
Step 13: 1884 + 157 = 2041
Step 14: 2041 + 157 = 2198
Step 15: 2198 + 157 = 2355
Step 16: 2355 + 157 = 2512
Step 17: 2512 + 157 = 2669
Step 18: 2669 + 157 = 2826
Step 19: 2826 + 157 = 2983
Step 20: 2983 + 157 = 3140
Step 21: 3140 + 157 = 3297
Step 22: 3297 + 157 = 3454
Step 23: 3454 + 157 = 3611
Step 24: 3611 + 157 = 3768
Step 25: 3768 + 157 = 3925
Step 26: 3925 + 157 = 4082
Step 27: 4082 + 157 = 4239
Step 28: 4239 + 157 = 4396
Step 29: 4396 + 157 = 4553
Step 30: 4553 + 157 = 4710
Step 31: 4710 + 157 = 4867
Step 32: 4867 + 157 = 5024
Step 33: 5024 + 157 = 5181
Step 34: 5181 + 157 = 5338
Step 35: 5338 + 157 = 5495
Step 36: 5495 + 157 = 5652
Step 37: 5652 + 157 = 5809
Step 38: 5809 + 157 = 5966
Step 39: 5966 + 157 = 6123
Step 40: 6123 + 157 = 6280
Step 41: 6280 + 157 = 6437

So, 157*41 = 6437