VTMO 2026 - Grade 7 - Semifinal - SET 6 - Self-study Question 10

Consider $-\frac42$, $\left(\frac14\right)^0$, $\frac13$, $-\frac{-1}{2}$, and $2.1$. How many belong to the rational numbers $\mathbb Q$ but not to the integers $\mathbb Z$?