High School 1 mathematics
Step 7 covers High School 1. Nine activities from this grade are now translated into English, with the same quizzes and best-score tracking as the Korean site — more High School 1 topics are on the way.
🔢 Number & operations
Binomial Expansion & Remainder Theorem
Match (a+b)ⁿ's coefficients to Pascal's Triangle, then verify the remainder theorem with synthetic division.
Open English lesson → ∩Sets & Propositions
Mark out Venn diagram regions with set operations, then compare a proposition's converse, inverse, and contrapositive.
Open English lesson → ➕Imaginary & Complex Numbers
From i²=−1 to polar form and Euler's formula, with a 10-question quiz.
Open English lesson → 🧩Binomial Squares, Factoring & Quadratics
See the binomial square formula as area, then find a quadratic equation's roots by factoring.
Open English lesson →📈 Functions & graphs
Linear Function Graph
Adjust the slope and y-intercept and watch the line move in real time.
Open English lesson → 📈Quadratic Function Graph
Adjust a, b, and c and watch the parabola and its vertex move in real time.
Open English lesson → 📉Equation of a Line
Move two points and watch the slope and equation update live, with parallel and perpendicular conditions.
Open English lesson →📊 Probability & statistics