Features:
1. Voice Calculator
- Hear numbers and calculation result
- Cute dinosaur theme
- Four operators + - × ÷

2. Calculation history
- Copiable calculation result
- Copiable entire expression

3. Arithmetic Exercise
- Unlimited random questions
- Preschool to elementary school
- Various difficulty levels
* Sums with 10
* Subtracting from 10
* Adding within 10
* Subtracting within 10
* Adding and subtracting within 10
* Adding within 20
* Adding whole tens
* Subtracting whole tens
* Adding and subtracting within 50
* Adding and subtracting within 100
* Adding and subtracting within 1000
* Multiplication tables 1 to 5
* Multiplication tables 5 to 9
* Multiplication within 25
* Multiplication within 81
* Multiplication and division within 81
* Multiply by whole tens
* Four operations within 1000

3. Secure
- No sign-in required.
- No personal information collected.