Without delay, let's solve this. We've got 906 and we will be multiplying it by 24, that is, adding 906 to itself 24 times.
Step 1: 0 + 906 = 906
Step 2: 906 + 906 = 1812
Step 3: 1812 + 906 = 2718
Step 4: 2718 + 906 = 3624
Step 5: 3624 + 906 = 4530
Step 6: 4530 + 906 = 5436
Step 7: 5436 + 906 = 6342
Step 8: 6342 + 906 = 7248
Step 9: 7248 + 906 = 8154
Step 10: 8154 + 906 = 9060
Step 11: 9060 + 906 = 9966
Step 12: 9966 + 906 = 10872
Step 13: 10872 + 906 = 11778
Step 14: 11778 + 906 = 12684
Step 15: 12684 + 906 = 13590
Step 16: 13590 + 906 = 14496
Step 17: 14496 + 906 = 15402
Step 18: 15402 + 906 = 16308
Step 19: 16308 + 906 = 17214
Step 20: 17214 + 906 = 18120
Step 21: 18120 + 906 = 19026
Step 22: 19026 + 906 = 19932
Step 23: 19932 + 906 = 20838
Step 24: 20838 + 906 = 21744

So, 906*24 = 21744