Grades 5-6 mathematics
Step 3 covers Grades 5-6. All 23 activities for this grade band are now translated into English, with the same quizzes and best-score tracking as the Korean site.
🔢 Number & operations
Mixed Calculation Lab
Check step by step which comes first — parentheses, multiplication/division, or addition/subtraction.
Open English lesson → 🔼Number Ranges & Rounding
Pick a reference number and an inequality, then compare rounding up, down, and to the nearest.
Open English lesson → 🔗GCD & LCM Lab
Enter two numbers and spot the overlap in their multiple lists.
Open English lesson → ▦Finding Divisors Lab
Enter a number and see every divisor laid out as a rectangle array.
Open English lesson → 🪣Water Jug Puzzle
Fill, empty, and pour between a few jugs to hit an exact target amount.
Open English lesson → 🍕Simplifying & Comparing Fractions
Drag a slider and watch simplifying and finding common denominators play out as bar diagrams.
Open English lesson →📈 Patterns & relationships
Corresponding Quantities Lab
See two quantities change together as a matched pair, in a table and a graph.
Open English lesson → ⚖️Ratio & Proportion Lab
Use a map scale and a sugar-water mixture to see how a ratio stays constant.
Open English lesson → 📊Proportions & Proportional Division Lab
Set up a proportion to find an unknown value, and split a whole by a given ratio.
Open English lesson →📐 Shape & measurement
Symmetry & Congruence Lab
Mirror a shape or rotate it 180° to check line symmetry and point symmetry.
Open English lesson → 🎁Rectangular Prism Parts Lab
Count a box's faces, edges, and vertices one by one to see its basic structure.
Open English lesson → 🔻Prisms & Pyramids Lab
Change the number of sides on the base and watch the face, edge, and vertex counts shift.
Open English lesson → 🥫Cylinders, Cones & Spheres Lab
Tap through three round solids and compare their parts and nets.
Open English lesson → 🎲Counting Unit Cubes Lab
Count how many blocks are stacked in a picture to build up spatial reasoning.
Open English lesson → 📐Geoboard Area Puzzle
Connect dots to build a shape and count grid squares to hit a target area exactly.
Open English lesson → 📐Triangle Base & Height Lab
Slide the vertex to build acute, right, and obtuse triangles, and confirm the area always matches.
Open English lesson → ◯Pi & Circumference Lab
Roll a circle and see for yourself how many diameters it travels.
Open English lesson → 🍕Circle Area Lab
Cut a circle into pizza-slice wedges and rearrange them into a rectangle to see the area formula.
Open English lesson → 🧱Rectangular Prism Surface Area & Volume Lab
Adjust length, width, and height with sliders and unfold the net to see surface area and volume change.
Open English lesson → 📐Cube Net Lab
Fold a net in a 3D viewer and compare all 11 arrangements that really make a cube.
Open English lesson →📊 Data
Mean, Median & Mode Lab
Type in your own numbers and see how the mean, median, and mode each shift.
Open English lesson → 🎲Coin & Dice Simulator Lab
Increase the number of trials and watch the results settle toward the true probability.
Open English lesson → 🥧Pie Chart Lab
Adjust each category's count with sliders and watch the wedge size (percentage, angle) change.
Open English lesson →