Decimal Calculator
Perform accurate decimal addition and subtraction with our easy-to-use calculator
Enter Decimal Numbers
Advanced Options
Calculation Result
Enter your numbers to see the step-by-step calculation.
📚 Decimal Arithmetic Guide
Adding Decimals
1. Write the numbers vertically with decimal points aligned
2. Add zeros to make numbers the same length
3. Add as with whole numbers
4. Place the decimal point in the answer directly below the other decimal points
Subtracting Decimals
1. Write the numbers vertically with decimal points aligned
2. Add zeros to make numbers the same length
3. Subtract as with whole numbers
4. Place the decimal point in the answer directly below the other decimal points
Decimal Place Values
Understand place values to the right of the decimal point:
- Tenths (1/10)
- Hundredths (1/100)
- Thousandths (1/1000)
- Ten-thousandths (1/10000)
- And so on...
Common Mistakes
- Misaligning decimal points
- Forgetting to add trailing zeros
- Miscounting decimal places in the answer
- Dropping the decimal point in the result
🧩 Practice Problems
| Problem | Solution | Try It |
|---|---|---|
| 3.14 + 2.71 | 5.85 | |
| 10.5 - 3.75 | 6.75 | |
| 0.006 + 0.0004 | 0.0064 | |
| 100.001 - 99.999 | 0.002 | |
| 7.89 + 8.123 | 16.013 |
Note: This calculator performs exact decimal arithmetic without floating-point rounding errors. For extremely large numbers or high precision requirements, results may be affected by JavaScript's number precision limitations.