Think of a water pipe: a longer pipe offers more resistance to water flow than a shorter pipe of the same diameter. If you cut the pipe in half, the resistance to water flow through that section is also cut in half.

Longer length, larger resistance; shorter length, smaller resistance.

According to the laws of electrical resistance, the resistance $R$ of a conductor of uniform cross-sectional area $A$ and length $l$ is given by the formula $R = \rho \frac{l}{A}$, where $\rho$ is the resistivity of the material. Since the material (copper), cross-sectional area, and temperature remain constant, the resistance is directly proportional to the length ($R \propto l$). Therefore, if length $l$ becomes $\frac{l}{2}$, the new resistance becomes $\frac{R}{2}$ or $0.5R$.

Always check if the wire is stretched or cut. If a wire is stretched to $n$ times its length, its resistance increases by $n^2$ times due to volume conservation ($R \propto l^2$). If it is simply cut, $R \propto l$ directly.