add_1( ... );
add_2( ... );
add_3( ... );
add_4( ... );
...
## And
quarter( ... );
eigth( ... );
sixteenth( ... );
...
three_quarters( ... );
seven_sixteenths( ... );
...
x_div_3_123_456_789_000( ... );
x_div_3_123_456_789_001( ... );
x_div_3_123_456_789_001_point_1( ... );
...