Sure thing, let's get straight to it. We start with 898 and we're going to multiply it by 15, which means adding 898 to itself 15 times.
Step 1: 0 + 898 = 898
Step 2: 898 + 898 = 1796
Step 3: 1796 + 898 = 2694
Step 4: 2694 + 898 = 3592
Step 5: 3592 + 898 = 4490
Step 6: 4490 + 898 = 5388
Step 7: 5388 + 898 = 6286
Step 8: 6286 + 898 = 7184
Step 9: 7184 + 898 = 8082
Step 10: 8082 + 898 = 8980
Step 11: 8980 + 898 = 9878
Step 12: 9878 + 898 = 10776
Step 13: 10776 + 898 = 11674
Step 14: 11674 + 898 = 12572
Step 15: 12572 + 898 = 13470

So, 898*15 = 13470