\"\"

\

The expression is 13\"\"39.

\

= 13(30 + 9)                 (Write 39 as the sum of 30 and 9)

\

Distribute terms using distributive property: a(b + c) = ab + ac.

\

= 13\"\"30 + 13\"\"9           (Distribute 13)

\

= 390 + 117                 (Multiply: 13\"\"30 = 39 and 13\"\"9 = 117)

\

= 507                             (Add: 390 + 117 = 507)\"\"

\

The product is \"\".