What is the convenience method to compare two NSNumbers with float values using limited precision?

What is the convenience method to compare two NSNumbers with float values
using limited precision?

What is the Objective-C convenience method for comparing a couple of
NSNumbers with float values to see if they are roughly equivalent (two
decimal places of precision is fine)?
I would use something other than floats if there was an option that did
not change the number around randomly. But anyway I'm already using floats
so... .
I imagine there must be something like:
[myNumber isEqualTo:myOtherNumber withPrecision:2];
But actually, amazingly I can't find such a convenience method. What am I
missing here?
Would it help to cast the two numbers to NSDecimal or something?