Macworld With news that iPadOS 18 might bring a calculator to the iPad we’ll refresh our memories as to why the iPad doesn’t have a calculator right now, and what the alternatives are if you want to do some math and it’s the only device you have handy. Ever since the iPad first arrived, there’s been a curious omission in the apps that come preinstalled by Apple. Whereas the iPhone, Mac, Apple Watch and even the iPod touch feature a calculator as standard, there’s never been one on the iPad. Why is that? Of all the platforms, it’s probably the one most suited to the task, especially if it was o…