LaTeX package file fillinblank.sty.

This is created for making notes for the ERG2013 remedial classes. My idea is to create a set of “fill-in-blank” notes for the students so that they are forced to attend the course and pay attention to my teaching. How about the solution? Actually I don’t want to prepare two separate set of notes. Hence this is the tool.

To use it, that’s very easy. See the following example:

\documentclass{article}
\usepackage{amsmath,amssymb}
\usepackage[answers]{fillinblank}

\begin{document}
\title{Example}
\maketitle

This is a \fillinblank{blank} in a sentence.

\begin{equation*}
\int_0^1 \fillinblank{x^2} dx= \frac{1}{3}
\end{equation*}

Try to find the solution of $x^2+2x-3=0$ by completing square.
\answerspace{
\begin{align*}
x^2 + 2x - 3 & = 0
(x^2 + 2x + 1) - 4 & = 0
(x+1)^2 & = 4
x+1 & = \pm 2
x & = -1 \pm 2
\therefore\ x & = -1 + 2 = 1
\textrm{or } x & = -1 - 2 = -3.
\end{align*}
}
\end{document}

The package receives an option: answers or noanswers, which denotes whether you want the output to be filled or not filled. The default is answers if not given.

The package provides the following commands:

• \showanswers: From the point onwards, all the blanks are filled, regardless of the option given when loading the package
• \noshowanswers: From the point onwards, all the blanks are not filled, regardless of the option given when loading the package
• \fillinspace{}: Provide a space and then put the items in the braces into the space. It is required that the space is an inline element.
• \fillinunderline{}: Provide an underline area and then put the items in the braces onto the underline area. It is required that the space is an inline element.
• \fillinblank{}: If currently we are in math mode, do \fillinspace, otherwise, do \fillinunderline
• \fillinblank*{}: If currently we are in math mode, do \fillinunderline, otherwise, do \fillinspace
• \answerspace{}: The item in the brace is a paragraph element, which means it is a block or a box. Provide a space for this block and fill the item in.

Edit (2018/1/26): There is an exam document class that serve a similar purpose, see http://www-math.mit.edu/~psh/exam/examdoc.pdf