Math outdoor activities for second grade are a great way to engage students in math concepts that can be difficult to grasp in the classroom. Here are some activities for second graders to explore math outside:

1. Measurement Scavenger Hunt: Ask students to measure items around the schoolyard or a nearby park, such as the length of a fence, the width of a sidewalk, or the circumference of a tree. Encourage them to use measuring tapes, rulers, and other measuring devices.

2. Nature Tracing: Have the students use string to trace patterns they find in the environment. For example, they can trace the outlines of leaves or footprints in the mud. Ask them to calculate the area or perimeter of the shape they've traced.

3. Shape Hunt: Ask students to find various shapes in the outdoors. They can look for circles created by tree trunks, triangles in leaves or animal footprints, and rectangles in man-made structures.

4. Jump Rope Math: Use a rope and have the students count out jumps. They can practice skip counting by 2s, 5s, and 10s, or make up their own patterns.

5. Sidewalk Chalk Math: Have the students make grids on the sidewalk and use chalk to draw circles and shapes that are divisible by different numbers. Ask them to count the sides of the shapes and calculate the area inside them.