Balance Scale
Find the mystery number that balances the scale, from missing numbers to equations.
What it teaches
- Adding and subtracting as hops on a number line
- Bridging through ten and splitting numbers
- Negative numbers and decimals
How to play
Step 1: Read the sum and find where the frog starts.
Step 2: Pick the lily pad where it lands.
Step 3: The frog hops to show the answer, with a tip when you need one.
Levels
Start where it feels easy. Inside each level the questions get harder or easier as you play.
- Level 1 · Ages 5–6Hops within 10Small hops forwards and backPlay level 1
- Level 2 · Ages 6–8Within 20Bridge through 10Play level 2
- Level 3 · Ages 7–9Within 100Tens, then across a tenPlay level 3
- Level 4 · Ages 9–12Negative numbersHop across zeroPlay level 4
- Level 5 · Ages 10–13DecimalsHops of tenthsPlay level 5
Try a question
Level 2
Where does the frog land?
1+6=?
Show the answer
Answer: 7
1 + 6 = 7
Start at 1 and hop 6 to the right.
Level 4
Where does the frog land?
−2+5=?
Show the answer
Answer: 3
−2 + 5 = 3
Adding moves right, taking away moves left. Count the hops as you cross 0.
The strategy behind it
Each level links to a short lesson that shows the trick step by step.
Practise on paper
Printable worksheets on the same topic, with answer keys.
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