Let's roll up our sleeves and solve this. We have 297 and we're going to multiply it by 23, essentially adding 297 to itself 23 times.
Step 1: 0 + 297 = 297
Step 2: 297 + 297 = 594
Step 3: 594 + 297 = 891
Step 4: 891 + 297 = 1188
Step 5: 1188 + 297 = 1485
Step 6: 1485 + 297 = 1782
Step 7: 1782 + 297 = 2079
Step 8: 2079 + 297 = 2376
Step 9: 2376 + 297 = 2673
Step 10: 2673 + 297 = 2970
Step 11: 2970 + 297 = 3267
Step 12: 3267 + 297 = 3564
Step 13: 3564 + 297 = 3861
Step 14: 3861 + 297 = 4158
Step 15: 4158 + 297 = 4455
Step 16: 4455 + 297 = 4752
Step 17: 4752 + 297 = 5049
Step 18: 5049 + 297 = 5346
Step 19: 5346 + 297 = 5643
Step 20: 5643 + 297 = 5940
Step 21: 5940 + 297 = 6237
Step 22: 6237 + 297 = 6534
Step 23: 6534 + 297 = 6831

So, 297*23 = 6831