What Is a Black Hole?
Sparks — free interactive lessons
Bite-size, playable lessons on any skill — built for Singapore primary students. Play any Spark free, no signup. Sign up to create your own.
How Big Is the Solar System?
Why The Moon Changes Shape
Why Does Popcorn Pop?
How Invisible Ink Works
Acids And Bases: Lemon Vs Soap
Why Onions Make You Cry
How Soap Cleans Away Dirt
What Dissolves And What Doesn't
Why Apples Turn Brown
How Glass Is Made From Sand
Why Does Bread Rise?
Why Baking Soda And Vinegar Fizz
Why Magnets Attract And Repel
States Of Matter: Solid, Liquid, Gas
Static Electricity With Balloons
How Does A Seesaw Balance?
Why We Float In Salty Water
How Parachutes Slow You Down
Why Paper Planes Fly Far
Why A Spinning Top Stays Up
How Gears Work Together
What Is Energy And Where It Comes From
How Pulleys Lift Heavy Things
Why Does a Ball Bounce?
Why Does Metal Rust?
Evaporation And Condensation At Home
How Our Eyes See Colour
Electricity and How Circuits Work
Why Does Ice Float On Water?
How Levers Make Lifting Easier
Friction: Why We Walk And Cars Stop
What Is Gravity?
How Sound Travels Through Air
Why Things Float or Sink
Sharing Fairly With Division
Reading a Thermometer: Positive and Negative
Factors and Multiples Explained
Rounding to the Nearest 10, 100, 1000
Mapping With Coordinates: X Marks The Spot
How Dice And Spinners Show Chance
Square Numbers and What Squared Means
Telling Time to the Minute
What Is a Ratio?
Odd And Even Number Patterns
Reading and Drawing Bar Graphs
Order Of Operations (BODMAS)
Comparing Decimals
Multiply Big Numbers In Your Head
How Calculators Add Numbers
Tessellations: Shapes That Tile Forever
Guess The Next Number
Measuring Area and Perimeter
The Maths Of Probability: Coins And Dice
Spotting Symmetry Everywhere
Percentages: Discounts And Sales
Reading a Clock Face
Negative Numbers and Owing Money
Why You Can't Divide by Zero
Estimating With Rounding