1. (5 points) Calculate: $29+42+87+55+94+31+68+76+13=$
495
【Analysis】According to the commutative and associative laws of addition.
【Solution】Solution: $29+42+87+55+94+31+68+76+13$
$$
\begin{array}{l}
=(29+31)+(42+68)+(87+13)+(94+76)+55 \\
=60+110+100+170+55 \\
=495
\end{array}
$$

Therefore, the answer is: 495.