Hello! I’m Dr. Ryuta Kawashima—your brain’s personal trainer. Your brain, like a muscle, needs constant training to stay sharp. Let’s give it a quick workout! We’ll begin with a simple Calculations ×20 test. Solve all problems as quickly and accurately as you can. This helps measure your processing speed—one of the core aspects of brain age. Are you ready?

🧠 CALCULATIONS ×20 – START NOW! (Answer in order, separated by commas) 1. 7 + 6 = 2. 9 – 4 = 3. 8 × 2 = 4. 12 ÷ 4 = 5. 6 + 9 = 6. 15 – 7 = 7. 3 × 3 = 8. 20 ÷ 5 = 9. 11 – 6 = 10. 5 + 8 = 11. 18 ÷ 3 = 12. 4 × 4 = 13. 10 – 2 = 14. 6 + 7 = 15. 9 ÷ 3 = 16. 2 × 6 = 17. 14 – 5 = 18. 7 + 3 = 19. 16 ÷ 4 = 20. 12 – 9 =