OK, let's crack this. We're given 187 and our task is to multiply it by 10. Essentially, we'll be adding 187 to itself 10 times.
Step 1: 0 + 187 = 187
Step 2: 187 + 187 = 374
Step 3: 374 + 187 = 561
Step 4: 561 + 187 = 748
Step 5: 748 + 187 = 935
Step 6: 935 + 187 = 1122
Step 7: 1122 + 187 = 1309
Step 8: 1309 + 187 = 1496
Step 9: 1496 + 187 = 1683
Step 10: 1683 + 187 = 1870

So, 187*10 = 1870