Exercise 1: Add & Subtract 1–4
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In this exercise, you’ll practice addition and subtraction using numbers 1 to 4. Each problem stays within 0–4, so you can solve it using your right hand only. Refresh or click “New Problem” to get a new question.
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Show the result on your right hand
💡 Tip: For subtraction, start from the larger number and “close” fingers one by one. For addition, start from the first number and “open” fingers for the second.
Learning Goals
- Fluency with finger positions for 0–4
- Mental calculation without counting aloud
- Transition smoothly between operations
How It Works
1 Random problem generated (e.g.,
3 + 1, 4 – 3)2 You solve it mentally or with your hand
3 Click “Show Answer” to verify — hand images appear