OK, let's work through this together. We're starting with 744 and we're going to multiply it by 24, which means we add 744 to itself 24 times.
Step 1: 0 + 744 = 744
Step 2: 744 + 744 = 1488
Step 3: 1488 + 744 = 2232
Step 4: 2232 + 744 = 2976
Step 5: 2976 + 744 = 3720
Step 6: 3720 + 744 = 4464
Step 7: 4464 + 744 = 5208
Step 8: 5208 + 744 = 5952
Step 9: 5952 + 744 = 6696
Step 10: 6696 + 744 = 7440
Step 11: 7440 + 744 = 8184
Step 12: 8184 + 744 = 8928
Step 13: 8928 + 744 = 9672
Step 14: 9672 + 744 = 10416
Step 15: 10416 + 744 = 11160
Step 16: 11160 + 744 = 11904
Step 17: 11904 + 744 = 12648
Step 18: 12648 + 744 = 13392
Step 19: 13392 + 744 = 14136
Step 20: 14136 + 744 = 14880
Step 21: 14880 + 744 = 15624
Step 22: 15624 + 744 = 16368
Step 23: 16368 + 744 = 17112
Step 24: 17112 + 744 = 17856

So, 744*24 = 17856