Pebblewise

Free interactive lessons

Little lessons you can play with

Each one is a hands-on mini classroom: drag, slide, watch what changes, then take a three-question quiz. Made for children aged 7–9 and a parent together. Opens on any phone, no account needed. Lesson content is in Chinese.

Special lesson

Special lesson

Moon phases lab

Drag the moon around Earth and see why it waxes and wanes

Today's goals

  • A 3D Sun–Earth–Moon scene you can drag and switch views on
  • Six short chapters with tasks that tick themselves
  • Record all 8 phases of a month
  • A three-question quiz that clears up the “Earth’s shadow” myth
Open lesson
Special lesson

Build the Hall of Prayer

Build Beijing's Hall of Prayer for Good Harvests in 8 steps, then spot the real one

Today's goals

  • Three marble terraces
  • 28 columns in three rings
  • Three blue roofs
  • Find the real hall in a photo
Start building

Grade 2

Grade 2 · Math

Telling time

Read the hour and minute hands to tell the time

Today's goals

  • Turn the minute hand and watch the hour hand follow
  • One lap of the minute hand moves the hour hand one step: 1 h = 60 min
  • Read the time in hours and minutes
  • Each big step of the minute hand is 5 minutes
Open lesson
Grade 2 · Math

Symmetry

Fold it in half and the two sides match exactly

Today's goals

  • Draw a symmetric pattern with the mirror painter
  • Complete the missing half of a picture
  • Fold-test three shapes for symmetry
  • Learn why a parallelogram is not symmetric
Open lesson
Grade 2 · Science

Magnet secrets

What does a magnet attract, and what happens when two meet?

Today's goals

  • Test everything to find what a magnet picks up
  • Discover that like poles push and unlike poles pull
  • Learn that not every metal is magnetic
  • Find out that the poles are the strongest parts
Open lesson
Grade 2 · Science

The compass

The little needle always points north and south

Today's goals

  • Turn around and watch the needle keep pointing north–south
  • Use the compass to find two places
  • Learn that the red end (N) points north
  • See how a nearby magnet fools the compass
Open lesson

Grade 3

Grade 3 · Math

Meet fractions

Share one thing equally and meet halves, thirds and quarters

Today's goals

  • Colour a shape and read the fraction
  • Change the number of equal parts and watch each piece grow or shrink
  • Learn that only equal parts make a fraction
  • Compare 1/2 and 1/4
Open lesson
Grade 3 · Math

Perimeter

Walk once around a shape: that is its perimeter

Today's goals

  • Send an ant around the edge and count the perimeter
  • Change the length and width and see how the perimeter is worked out
  • Learn that a rectangle's length and width each count twice
  • Learn that only closed shapes have a perimeter
Open lesson
Grade 3 · Science

Moon phases

Why is the moon sometimes round and sometimes a sliver?

Today's goals

  • Move the moon around Earth and find the four main phases
  • Explain why the moon seems to change shape
  • Learn that the full moon comes around the 15th of the lunar month
  • Tell a first-quarter moon from a last-quarter moon
Open lesson
Grade 3 · Science

Three states of water

Ice, water and steam are all the same water

Today's goals

  • Heat ice and watch it melt
  • Keep heating to 100 °C and watch water boil into vapour
  • Learn that the white cloud at the spout is not water vapour
  • Learn that water evaporates even without boiling
Open lesson

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Free interactive lessons for grades 2–3: math and science, no sign-up | Pebblewise