OK, let's work through this together. We're starting with 529 and we're going to multiply it by 40, which means we add 529 to itself 40 times.
Step 1: 0 + 529 = 529
Step 2: 529 + 529 = 1058
Step 3: 1058 + 529 = 1587
Step 4: 1587 + 529 = 2116
Step 5: 2116 + 529 = 2645
Step 6: 2645 + 529 = 3174
Step 7: 3174 + 529 = 3703
Step 8: 3703 + 529 = 4232
Step 9: 4232 + 529 = 4761
Step 10: 4761 + 529 = 5290
Step 11: 5290 + 529 = 5819
Step 12: 5819 + 529 = 6348
Step 13: 6348 + 529 = 6877
Step 14: 6877 + 529 = 7406
Step 15: 7406 + 529 = 7935
Step 16: 7935 + 529 = 8464
Step 17: 8464 + 529 = 8993
Step 18: 8993 + 529 = 9522
Step 19: 9522 + 529 = 10051
Step 20: 10051 + 529 = 10580
Step 21: 10580 + 529 = 11109
Step 22: 11109 + 529 = 11638
Step 23: 11638 + 529 = 12167
Step 24: 12167 + 529 = 12696
Step 25: 12696 + 529 = 13225
Step 26: 13225 + 529 = 13754
Step 27: 13754 + 529 = 14283
Step 28: 14283 + 529 = 14812
Step 29: 14812 + 529 = 15341
Step 30: 15341 + 529 = 15870
Step 31: 15870 + 529 = 16399
Step 32: 16399 + 529 = 16928
Step 33: 16928 + 529 = 17457
Step 34: 17457 + 529 = 17986
Step 35: 17986 + 529 = 18515
Step 36: 18515 + 529 = 19044
Step 37: 19044 + 529 = 19573
Step 38: 19573 + 529 = 20102
Step 39: 20102 + 529 = 20631
Step 40: 20631 + 529 = 21160

So, 529*40 = 21160