Alright, let's solve this math problem step by step. First, we have the number 231. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 40. So, we're going to take the number 231 and add it to itself 40 times.
Step 1: 0 + 231 = 231
Step 2: 231 + 231 = 462
Step 3: 462 + 231 = 693
Step 4: 693 + 231 = 924
Step 5: 924 + 231 = 1155
Step 6: 1155 + 231 = 1386
Step 7: 1386 + 231 = 1617
Step 8: 1617 + 231 = 1848
Step 9: 1848 + 231 = 2079
Step 10: 2079 + 231 = 2310
Step 11: 2310 + 231 = 2541
Step 12: 2541 + 231 = 2772
Step 13: 2772 + 231 = 3003
Step 14: 3003 + 231 = 3234
Step 15: 3234 + 231 = 3465
Step 16: 3465 + 231 = 3696
Step 17: 3696 + 231 = 3927
Step 18: 3927 + 231 = 4158
Step 19: 4158 + 231 = 4389
Step 20: 4389 + 231 = 4620
Step 21: 4620 + 231 = 4851
Step 22: 4851 + 231 = 5082
Step 23: 5082 + 231 = 5313
Step 24: 5313 + 231 = 5544
Step 25: 5544 + 231 = 5775
Step 26: 5775 + 231 = 6006
Step 27: 6006 + 231 = 6237
Step 28: 6237 + 231 = 6468
Step 29: 6468 + 231 = 6699
Step 30: 6699 + 231 = 6930
Step 31: 6930 + 231 = 7161
Step 32: 7161 + 231 = 7392
Step 33: 7392 + 231 = 7623
Step 34: 7623 + 231 = 7854
Step 35: 7854 + 231 = 8085
Step 36: 8085 + 231 = 8316
Step 37: 8316 + 231 = 8547
Step 38: 8547 + 231 = 8778
Step 39: 8778 + 231 = 9009
Step 40: 9009 + 231 = 9240

So, 231*40 = 9240