This document describes a math activity for elementary school students called "Space Tour in Mars" that teaches addition and subtraction. The activity involves students counting the number of passengers getting on and off a space tour bus at different stations on Mars. At each station, students must use addition or subtraction to determine how many passengers are on the bus. In the end, students report the total number of passengers left on the bus after completing all the stations. The activity aligns with primary school mathematics curriculum standards around teaching addition and subtraction in real-life situations.