---
title: "subtracting(_:withBehavior:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/nsdecimalnumber/subtracting(_:withbehavior:)"
---

# subtracting(_:withBehavior:)

Subtracts this a given number from this one using the specified behavior.

## Declaration

```swift
func subtracting(_ decimalNumber: NSDecimalNumber, withBehavior behavior: (any NSDecimalNumberBehaviors)?) -> NSDecimalNumber
```

## Discussion

Discussion behavior specifies the handling of calculation errors and rounding.

## See Also

### Performing Arithmetic

- [adding(_:)](foundation/nsdecimalnumber/adding(_:).md)
- [subtracting(_:)](foundation/nsdecimalnumber/subtracting(_:).md)
- [multiplying(by:)](foundation/nsdecimalnumber/multiplying(by:).md)
- [dividing(by:)](foundation/nsdecimalnumber/dividing(by:).md)
- [raising(toPower:)](foundation/nsdecimalnumber/raising(topower:).md)
- [multiplying(byPowerOf10:)](foundation/nsdecimalnumber/multiplying(bypowerof10:).md)
- [adding(_:withBehavior:)](foundation/nsdecimalnumber/adding(_:withbehavior:).md)
- [multiplying(by:withBehavior:)](foundation/nsdecimalnumber/multiplying(by:withbehavior:).md)
- [dividing(by:withBehavior:)](foundation/nsdecimalnumber/dividing(by:withbehavior:).md)
- [raising(toPower:withBehavior:)](foundation/nsdecimalnumber/raising(topower:withbehavior:).md)
- [multiplying(byPowerOf10:withBehavior:)](foundation/nsdecimalnumber/multiplying(bypowerof10:withbehavior:).md)