How many times go into 7/8 pounds in 4

As the only prime factor of denominator is
2
, in fact there are three twos (
2
×
2
×
2
) we can can convert the fraction
7
8
by multiplying numerator and denominator by
5
×
5
×
5
.
Hence,
7
8
=
7
×
5
×
5
×
5
8
×
5
×
5
×
5
=
875
1000
=
0.875

(This is always possible if only prime factors of denominator are
2
's and
5
's - just multiply by as many
5
's and
2
's).