OK, let's work through this together. We're starting with 713 and we're going to multiply it by 40, which means we add 713 to itself 40 times.
Step 1: 0 + 713 = 713
Step 2: 713 + 713 = 1426
Step 3: 1426 + 713 = 2139
Step 4: 2139 + 713 = 2852
Step 5: 2852 + 713 = 3565
Step 6: 3565 + 713 = 4278
Step 7: 4278 + 713 = 4991
Step 8: 4991 + 713 = 5704
Step 9: 5704 + 713 = 6417
Step 10: 6417 + 713 = 7130
Step 11: 7130 + 713 = 7843
Step 12: 7843 + 713 = 8556
Step 13: 8556 + 713 = 9269
Step 14: 9269 + 713 = 9982
Step 15: 9982 + 713 = 10695
Step 16: 10695 + 713 = 11408
Step 17: 11408 + 713 = 12121
Step 18: 12121 + 713 = 12834
Step 19: 12834 + 713 = 13547
Step 20: 13547 + 713 = 14260
Step 21: 14260 + 713 = 14973
Step 22: 14973 + 713 = 15686
Step 23: 15686 + 713 = 16399
Step 24: 16399 + 713 = 17112
Step 25: 17112 + 713 = 17825
Step 26: 17825 + 713 = 18538
Step 27: 18538 + 713 = 19251
Step 28: 19251 + 713 = 19964
Step 29: 19964 + 713 = 20677
Step 30: 20677 + 713 = 21390
Step 31: 21390 + 713 = 22103
Step 32: 22103 + 713 = 22816
Step 33: 22816 + 713 = 23529
Step 34: 23529 + 713 = 24242
Step 35: 24242 + 713 = 24955
Step 36: 24955 + 713 = 25668
Step 37: 25668 + 713 = 26381
Step 38: 26381 + 713 = 27094
Step 39: 27094 + 713 = 27807
Step 40: 27807 + 713 = 28520

So, 713*40 = 28520