Sure thing! We've got 238 and we're gonna multiply it by 21. That's the same as adding 238 to itself 21 times.
Step 1: 0 + 238 = 238
Step 2: 238 + 238 = 476
Step 3: 476 + 238 = 714
Step 4: 714 + 238 = 952
Step 5: 952 + 238 = 1190
Step 6: 1190 + 238 = 1428
Step 7: 1428 + 238 = 1666
Step 8: 1666 + 238 = 1904
Step 9: 1904 + 238 = 2142
Step 10: 2142 + 238 = 2380
Step 11: 2380 + 238 = 2618
Step 12: 2618 + 238 = 2856
Step 13: 2856 + 238 = 3094
Step 14: 3094 + 238 = 3332
Step 15: 3332 + 238 = 3570
Step 16: 3570 + 238 = 3808
Step 17: 3808 + 238 = 4046
Step 18: 4046 + 238 = 4284
Step 19: 4284 + 238 = 4522
Step 20: 4522 + 238 = 4760
Step 21: 4760 + 238 = 4998

So, 238*21 = 4998