4. (5 points) As shown in the figure, a grasshopper stands at position 1. On the 1st jump, it moves 1 step and stands at position 2; on the 2nd jump, it moves 2 steps and stands at position 4; on the 3rd jump, it moves 3 steps and stands at position 1... On the $n$-th jump, it moves $n$ steps. When the grasshopper jumps 100 times in a clockwise direction, it will be at position $\qquad$.
【Solution】Solution (1) When the grasshopper jumps 100 times, it jumps a total of $(1+100) \times 100 \div 2=5050$ (steps).
(2) $5050 \div 6=841 \cdots 4$, so, when it has jumped 100 times, it reaches the 5th position. Therefore, the answer is: 5 .