Calculator

iPads have never shipped with a calculator app.

There are literally hundreds of free and paid calculator apps for iPad/iPadOS in the iOS App Store.

Should be able to find a calculator app that you like and meets your needs there.

Best of Luck to You!

Nope, you need to download one from the App Store,

No but the iPhone does :)

Suggest feedback to Apple: https://www.apple.com/feedback/

May be try Microsoft Math Solver? https://math.microsoft.com/en/

You may use the iPad’s Search bar to do simple calculations.

Use Search on your iPhone, iPad, or iPod touch - Apple Support