How much is a 25% discount on a $400 shirt? In this level, you practice percentage calculations as they appear in real life. Quickly calculating percentages makes you more independent in everything from shopping to personal finance.

Let's pick up the pace! Rapid mental math isn't just about knowing the answers, it's about your brain reacting lightning fast. We mix different arithmetic operations under time pressure to maximize your math sharpness and confidence.

High-frequency Spanish nouns from English for routines, money, media, and thinking—lunch, showers, messages, language, and sentences.

High-frequency Swedish nouns from English for routines, money, media, and thinking—lunch, showers, messages, language, and sentences.

Explore elements 85–96, including the beginning of the actinide series and radioactive elements.

Master elements 73–84, including heavy metals and metalloids with important industrial uses.