2.5
3.37500
188.
889
Seven and one third minus three and one half = 23/6 or 35/6
5 or -5
One half is nine eighteenths. Nine eighteenths minus three eighteenths is six eighteenths, which is also one third.
Three-sixths minus two-sixths is one-sixth.
1.75 or one and three quarters
9/10
Expressed as a proper fraction in its simplest form, 3/7 - 1/2 = -1/14 or negative one fourteenth. Expressed as a decimal, this is equal to -0.0714285 recurring (that is, 0.0714285714285...)