Grades 3-4 mathematics
Step 2 covers Grades 3-4. All 16 activities for this grade band are now translated into English, with the same quizzes and best-score tracking as the Korean site.
🔢 Number & operations
Place Value Blocks
See how the same digit means something different depending on its place.
Open English lesson → ✖️Multiplication & Division
Practice multiplying and dividing bigger numbers.
Open English lesson → 🍰Comparing Fractions
Compare fraction sizes side by side.
Open English lesson → 🎯Natural Number Estimation Lab
Estimate before calculating with large numbers, so you can first predict roughly what the answer should be.
Open English lesson →📈 Patterns & relationships
The Equals Sign & Balance
Balance both sides of an equation like a scale.
Open English lesson → ⚖️Balance Scale Equality Lab
Experience what the equals sign (=) means by making both sides of a balance scale equal. The scale is level only when the weights on both sides are the same.
Open English lesson → 🔁Isometry Transformations Lab
Move a shape by translating, rotating, or reflecting it to see how an isometry changes its coordinates while keeping its shape and size exactly the same.
Open English lesson →📐 Shape & measurement
Lines & Angles Basics
Sort pairs of lines into parallel, perpendicular, or just meeting.
Open English lesson → ⭕Circle, Triangle, Rectangle Sort
Classify shapes by their sides and angles.
Open English lesson → 🔺Name the Polygon
Count sides to name each polygon.
Open English lesson → ⊹Moving Shapes on a Coordinate Grid
Reflect, slide, or rotate a triangle and track the coordinates.
Open English lesson → 🕐Time Calculator
Move the clock hands and calculate elapsed time.
Open English lesson → 📏Estimating Length, Volume & Weight
Build a sense for how big everyday objects are.
Open English lesson → 📐Angle Measuring
Read angles with a virtual protractor.
Open English lesson → 📏Length Unit Conversion Lab
Move the slider between mm, cm, m, and km to build an intuitive sense of how the number changes when the unit changes.
Open English lesson →📊 Data