OK, let's work through this together. We're starting with 226 and we're going to multiply it by 21, which means we add 226 to itself 21 times.
Step 1: 0 + 226 = 226
Step 2: 226 + 226 = 452
Step 3: 452 + 226 = 678
Step 4: 678 + 226 = 904
Step 5: 904 + 226 = 1130
Step 6: 1130 + 226 = 1356
Step 7: 1356 + 226 = 1582
Step 8: 1582 + 226 = 1808
Step 9: 1808 + 226 = 2034
Step 10: 2034 + 226 = 2260
Step 11: 2260 + 226 = 2486
Step 12: 2486 + 226 = 2712
Step 13: 2712 + 226 = 2938
Step 14: 2938 + 226 = 3164
Step 15: 3164 + 226 = 3390
Step 16: 3390 + 226 = 3616
Step 17: 3616 + 226 = 3842
Step 18: 3842 + 226 = 4068
Step 19: 4068 + 226 = 4294
Step 20: 4294 + 226 = 4520
Step 21: 4520 + 226 = 4746

So, 226*21 = 4746