Sure thing! We've got 207 and we're gonna multiply it by 15. That's the same as adding 207 to itself 15 times.
Step 1: 0 + 207 = 207
Step 2: 207 + 207 = 414
Step 3: 414 + 207 = 621
Step 4: 621 + 207 = 828
Step 5: 828 + 207 = 1035
Step 6: 1035 + 207 = 1242
Step 7: 1242 + 207 = 1449
Step 8: 1449 + 207 = 1656
Step 9: 1656 + 207 = 1863
Step 10: 1863 + 207 = 2070
Step 11: 2070 + 207 = 2277
Step 12: 2277 + 207 = 2484
Step 13: 2484 + 207 = 2691
Step 14: 2691 + 207 = 2898
Step 15: 2898 + 207 = 3105

So, 207*15 = 3105