:prealgebra, pre-algebra, number,
number conversion, convert number, 
decimal, fraction, percent, percentage

:datatype, numeric

:operation, Fraction
operation, Decimal
operation, Percent

:<TD ALIGN=LEFT style="text-align:center;" HEIGHT=30 NOWRAP>Convert: 
 <INPUT TYPE=TEXT NAME="formula" SIZE=25 MAXLENGTH=100 VALUE="$var_1"></TD>
 <TD ALIGN=RIGHT VALIGN=center NOWRAP> to : 
 $submit1
 $submit2
 $submit3

:18/7, 23/8, -4/37, 3.14159265, 2.718281828, 2.41421
