Olympiad puzzles, speed math, fractions & decimals
Start →Water cycle, states of matter, home experiment
Start →World map, continents, oceans & landforms
Start →Government, rights, responsibilities & crossword
Start →Logic, deduction, analogies & reasoning
Start →Flashcards, journal & goal setting
Start →Olympiad problems aren't like regular math — they require creative thinking. Here are strategies:
Don't worry if you get some wrong — that's how your brain grows! 🧠
Solve these creative problems. Think carefully!
How many arithmetic problems can you solve in 60 seconds?
To add or subtract fractions, they need the same denominator (bottom number).
Tip: You can also enter answers as decimals (5/6 ≈ 0.83)
Add or subtract these fractions. Enter your answer as a fraction (like 5/6) or a decimal. Equivalent fractions are accepted (e.g. 2/4 counts as 1/2).
Key conversions to memorize:
Look at the difference or ratio between numbers:
Part A: Convert these decimals to fractions.
Part B: Find the missing number in each sequence.
One bonus brain-buster each day for extra stars!
Get a fresh word problem to solve!
Water is always on the move! The water cycle is the continuous journey water takes between the Earth's surface and the atmosphere. It has four main stages.
Evaporation happens when the sun heats water in oceans, lakes, and rivers. The water turns into an invisible gas called water vapor and rises into the air. Plants also release water vapor through their leaves in a process called transpiration.
As water vapor rises higher, the air gets cooler. The vapor cools and turns back into tiny water droplets that cling to dust particles in the air. This is called condensation, and it's how clouds form. You can see condensation on a cold glass of lemonade on a hot day!
When clouds collect enough water droplets, the droplets combine and get heavy. They fall back to Earth as precipitation—rain, snow, sleet, or hail, depending on the temperature.
After precipitation, water flows into streams, rivers, lakes, and oceans in a process called collection. Some water soaks into the ground and becomes groundwater, which plants use or which slowly flows into larger bodies of water.
Here's an amazing fact: the water on Earth today is the same water that has been here for billions of years. The very same water molecules that dinosaurs drank 65 million years ago could be in your glass of water right now! Water is never created or destroyed in the water cycle—it just changes form and location.
All matter exists in one of three states. The difference is how the particles (molecules) behave:
Click an item to select it, then click the correct bucket to place it. Click a placed item to remove it.
When you add or remove heat energy, matter changes state:
Materials: Clear glass or jar, sparkling water (or any clear soda), 5-8 raisins
Fill the glass about 3/4 full with sparkling water.
Drop 5-8 raisins into the glass.
Watch carefully for 2-3 minutes. What happens?
The raisins should sink, then rise, then sink again - they're dancing!
💡 Why it works: Carbon dioxide (CO₂) bubbles in the sparkling water attach to the rough surface of the raisins. The bubbles act like tiny balloons, making the raisins buoyant enough to float. At the surface, the bubbles pop and the raisins sink again. This demonstrates buoyancy and density!
Write your observations:
Label the numbered locations on the world map.
Continents (red markers):
Oceans (blue markers):
Type a continent name and press Add. Try to name all 7!
Type an ocean name and press Add. Try to name all 5!
Which continent is this country on? Click the correct continent!
Pick one continent and write 3 cool facts about it!
My continent:
3 cool facts:
The United States has three levels of government, each with different jobs:
Is it a Local, State, or Federal government job? Choose wisely!
Tip: Some letters are shared between Across and Down words. Fill in the ones you're sure about first!
Fill in the crossword using the clues below.
Name 3 rights you have as a student/citizen:
Name 3 responsibilities you have:
Write 2 classroom rules you think are important and explain why each one is fair.
Why do communities need rules? Write 3-4 sentences.
An analogy shows how two pairs of things are related in the same way.
Tip: First figure out the relationship between the first pair, then apply it to the second pair.
Figure out the relationship and complete the analogy!
Deduction means using clues to figure out the answer. Read each clue carefully and eliminate what doesn't fit.
Strategy: Write down what you know from each clue, then combine them.
Use the clues to figure out the answer!
These puzzles ask you to think about numbers in creative ways — not just add or subtract!
Solve these tricky number riddles!
Read the clues carefully and figure out the answer!
Review the questions you got wrong. Click a card to flip it!
One thing I learned in Math:
One thing I learned in Science:
One thing I learned in Geography:
One thing I learned in Social Studies:
One thing I learned in Brain Puzzle:
One thing I thought was cool:
One thing I still wonder about:
What topic do you want to explore more?