Elementary mathematics
Step 1 covers Grades 1–2. All 14 activities for this grade band are now translated into English, with the same quizzes and best-score tracking as the Korean site. Grades 3–4 are live too →
🔢 Number & operations
Make Ten
Find the number partner that completes ten.
Open English lesson → ✖️Multiplication Arrays
See why groups × items-per-group gives that answer.
Open English lesson → 🔢Carrying & Borrowing Lab
Represent two-digit numbers as tens and ones blocks, then drag sliders to see exactly when carrying and borrowing kick in.
Open English lesson → 🌾Russian Peasant Multiplication
Try a multiplication method that repeatedly halves one number and doubles the other, without memorizing multiplication tables, and see its connection to binary arithmetic.
Open English lesson →📈 Patterns
Pattern Finder
Figure out what shape comes next in a repeating pattern.
Open English lesson → 📿Bead Pattern Necklace Lab
Look at the repeating bead pattern, choose the bead that comes next, and complete your own necklace.
Open English lesson →📐 Shape & measurement
Shape Finder
Count sides and vertices, then identify the shape.
Open English lesson → 📦Solid Shape Families
Explore boxes, cylinders, and spheres in the world around us.
Open English lesson → 📏Comparing Things
Compare length, weight, area, and volume.
Open English lesson → 🕐Clock Reading
Read the short and long hands to tell the time.
Open English lesson → ⏰Minutes Before and After
Move the clock hands with sliders to see what time it'll be after a set number of minutes — and what it was before.
Open English lesson → 📏Measuring Length With a Ruler
Line up the 0 mark on a virtual ruler, read the scale, then try guessing lengths by eye.
Open English lesson → 🧱Block Building Shape Lab
Look at the target shape and build the same shape with blocks. Each time you click a column, one block is added.
Open English lesson →📊 Data