03/19/2026
New S2C Lesson: Time Travel and Modular Arithmetic
This lesson, by Certified S2C Practitioner, Ketllyn Vieira, introduces modular arithmetic (clock math) through a fun time-travel theme. Modular arithmetic works with integers and focuses on the remainder when numbers “wrap around” a fixed value called the modulus (like 12 hours on a clock or 7 days in a week).
Using this system, you can calculate time by moving forward or backward without going outside the cycle. The lesson shows how modular arithmetic helps solve real-world time problems, such as finding future or past times on a clock, calculating days of the week using mod 7, and breaking larger time jumps into manageable parts (days + leftover hours).
Check out the lesson: https://i-asc.org/lessons/time-travel-and-modular-arithmetic/
A spiral clock design is on the top of the image. At the center is the I-ASC logo, with a bold label reading “NEW S2C LESSON.” The title “Time Travel and Modular Arithmetic” stands out prominently. The author is credited as Ketllyn Vieira, Certified S2C Practitioner. The design includes a soft blue gradient background, a pencil on the left, and an alphabet board on the right, reinforcing the learning theme.]