Step-by-step solver 1

The initial problem is a frame.

Each digit pair we multiply is a frame. Highlight the specific digits being multiplied each frame.

When adding the partial products, adding each column is a frame.

For adding using the standard algorithm, a \phantom{^1} should be placed immediately before a digit iff there are no digits above it. Example:

$$\begin{array}{rrrr} & ^12 & ^11 & 6 \\ ^13 & 4 & 1 & 1 \\ & 2 & 9 & 8 \end{array}$$