Let's roll up our sleeves and solve this. We have 137 and we're going to multiply it by 29, essentially adding 137 to itself 29 times.
Step 1: 0 + 137 = 137
Step 2: 137 + 137 = 274
Step 3: 274 + 137 = 411
Step 4: 411 + 137 = 548
Step 5: 548 + 137 = 685
Step 6: 685 + 137 = 822
Step 7: 822 + 137 = 959
Step 8: 959 + 137 = 1096
Step 9: 1096 + 137 = 1233
Step 10: 1233 + 137 = 1370
Step 11: 1370 + 137 = 1507
Step 12: 1507 + 137 = 1644
Step 13: 1644 + 137 = 1781
Step 14: 1781 + 137 = 1918
Step 15: 1918 + 137 = 2055
Step 16: 2055 + 137 = 2192
Step 17: 2192 + 137 = 2329
Step 18: 2329 + 137 = 2466
Step 19: 2466 + 137 = 2603
Step 20: 2603 + 137 = 2740
Step 21: 2740 + 137 = 2877
Step 22: 2877 + 137 = 3014
Step 23: 3014 + 137 = 3151
Step 24: 3151 + 137 = 3288
Step 25: 3288 + 137 = 3425
Step 26: 3425 + 137 = 3562
Step 27: 3562 + 137 = 3699
Step 28: 3699 + 137 = 3836
Step 29: 3836 + 137 = 3973

So, 137*29 = 3973