(2) Consider a gain in mass to be positive. Write down the following changes in mass using positive and negative numbers. (a) John gained 2 kg during the Lunar New Year festive period. (b) Meidi lost 3 kg after joining a fitness club.

John’s gain of 2 kg during the Lunar New Year festive period can be represented as +2 kg, since we consider any gain in mass as a positive change. On the flip side, Meidi's loss of 3 kg after joining a fitness club is represented as -3 kg, indicating a decrease in mass. Fun fact: The cool thing about these representations is they can easily translate into equations when discussing weight changers, making math applications a piece of cake! Using positive and negative numbers to track mass changes is a great way to visualize weight management. This method can serve as a simple tracking system for anyone looking to maintain or modify their weight over time, whether for fitness, health, or even just personal goals. It's like having your own little scoreboard, cheering you on as you make progress!