Garry, Sorry to take so long...I don't use mathematical questions, so all I can provide to you is the info directly from the GIFT format documentation (the yellow ? beside Import Questions From File on the Editing Quiz page.) If this isn't enough to solve your proeblems I suggest you do a brand new post that requests help specifically with numerical questions in GIFT format.

Regards,

Lane

__"Numerical:__

The answer section for Numerical questions must start with a number sign (#).
Numerical answers can include an error margin, which is written following the correct answer, separated by a colon.
So for example, if the correct answer is anything between 1.5 and 2.5, then it would be written as follows __{#2:0.5}__.
This indicates that 2 with an error margin of 0.5 is correct (i.e., the span from 1.5 to 2.5).
If no error margin is specified, it will be assumed to be zero.

When was Ulysses S. Grant born? {#1822}

What is the value of pi (to 3 decimal places)? {#3.1415:0.0005}.

Optionally, numerical answers can be written as a span in the following format {#*MinimumValue*..*MaximumValue*}.

What is the value of pi (to 3 decimal places)? {#3.141..3.142}.

Moodle's
browser interface does not support multiple numerical answers, but
Moodle's code can and so does GIFT. This can be used to specify
numerical multiple spans, and can be particularly usefully when
combined with percentage weight grades. If multiple answers are used,
they must be separated by an equal sign, like short answer questions.

When was Ulysses S. Grant born? {#

=1822:0

=%50%1822:2}

Note that since Moodle's browser GUI doesn't support multiple answers for Numerical questions,
there's no way to see them or edit them through Moodle.
The only way to change a numerical answer beyond the first, is to delete the question
and re-import it (or use something like phpMyAdmin)."