Which calculator should I start with?

The paycheck calculator, unless the lesson is a loan, a mortgage, or a deal model. Each widget page has its own snippet.

Is this financial advice?

No. It is educational material. The widget applies a formula to the inputs typed into it.

Embed in Google Sites

Embed a calculator in Sites

In Google Sites, insert an Embed block, choose Embed code, and paste the snippet from the widget page. Publish. Students drag or type on your page with no extra login.

Pick a calculator on the widgets hub, or start with the paycheck widget. Classroom notes: teachers. Term: net pay.

Steps

Open the widget page for the calculator you want and copy the snippet, caption included.
In Google Sites, choose Insert, Embed, Embed code.
Paste, then publish the site.

Paycheck snippet to paste

<iframe
  src="https://www.financelearn.org/embed/paycheck-calculator"
  width="100%" height="480" style="border:0"
  title="Paycheck calculator and FICA split"
></iframe>
<p style="font:14px/1.5 system-ui,sans-serif;margin:.5rem 0 0">
  <a href="https://www.financelearn.org/calculators/paycheck-calculator?utm_source=embed&utm_medium=referral&utm_campaign=embed-calculators">Paycheck calculator and FICA split</a>
  by <a href="https://www.financelearn.org/?utm_source=embed&utm_medium=referral&utm_campaign=embed-calculators">FinanceLearn</a>
</p>

Other hosts: Canvas, Schoology, Moodle, WordPress, Notion.

This page is educational material, not financial advice. The figures come from the formula shown and assume the inputs you enter hold for the whole term. Your own rate, fees, taxes and timing will differ, so treat the output as arithmetic to check a decision against, not as a recommendation.