-1 716/1000 can be simplified by getting and touching the fraction part. Just don't mind yet the whole number part.
The numerator 716 and the denominator 1000 are divisible by 4. So divide the numerator and denominator by 4
716 / 4 = 179
1000 / 4 = 250
So the new fraction is -1 179/250
Converting it to improper fraction, we get.
-429/250