Answer
Fill the blanks with:
Step 1: 1, 5, 15
Step 2: 1, 5
Work Step by Step
Place
...$ 13_{ten}=1\times8+5\times1=15_{eight}$
Step 2.
place (carry) the 1 above the eights' column,
place (record) the 5 under the ones' column.
Fill the blanks with:
Step 1: 1, 5, 15
Step 2: 1, 5