How do I delete my account when my I pad was broken and I threw it away?

Delete the account from where? For what purpose exactly?

The iPad itself has no bearing on what happens to your account.

Your account contains all your purchases and subscriptions and can be used on another device.

What exactly are you trying to do?

If you are being billed for something, follow the steps here to find it and cancel the subscription: link-> How to cancel a subscription from Apple - Apple Support

Which is very different than deleting your Apple ID account entirely.

If you can't use any of the devices listed in the link above to cancel your subscription, then contact Apple Support directly by clicking the link here: link-> Contact Apple Support

Delete from where? Do you want to completely wipe your account from existence so it cannot be used anywhere else? Or are you trying to simply remove it from your iPad?

Repeating the same thing is not helpful. Explain your issue. Use full sentences.