Create multiplying_fractions_by_integers

Create multiplying_fractions_by_integers from multiplying_fractions
update multiplying fractions by integers
fix a few bugs
whoops, forgot to change that back
close p and code tags on line 32
fix bug with GCD
hints don't show extra step
use Peter's updates to simplify code

See pull request:
#44651 Reduce number of data-ensure loops and variables
explain hints
add newline & take out unneeded simplification
take out colon

just looks kinda' weird...
Merge pull request #44649 from ifingerson/fraction_x_whole_num

Multiplying fractions by integers, trello #555