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Lesson 04 / 21 · Beginner

Money, prices and units

Separate an amount from its price and its purchasing power.

10 MIN WITH PRACTICEREAD → TRY → REFLECTNO WALLET NEEDED

By the end, you’ll be able to…

  • Convert BTC and sats without rounding away meaning.
  • Separate a market quote from an amount you own.
Your learning map

Three questions to carry into this lesson.

01Convert BTC and sats without rounding away meaning.
02Separate a market quote from an amount you own.
Use these goals to guide your reading. Try the paper exercise, then explain the result in your own words.

Three different questions

An amount answers how much of an asset exists in a record. A price answers what another party offers in exchange. Purchasing power asks what useful goods that amount can obtain. These are related, but they are not the same. A wallet showing an unchanged number of sats can display a changing local-currency estimate because the price feed moved. Neither display tells you whether a particular shop accepts bitcoin.

Make the unit visible

One BTC contains 100 million sats. In an illustrative ledger, 0.002 BTC is 200,000 sats. If an application silently switches from BTC to another unit, the digits become misleading. Label both the quantity and currency, use consistent decimal places, and keep calculation precision separate from a rounded display. A zero after rounding is not always an actual zero balance.

Read a quote as a dated offer

Imagine two fictional shops pricing the same item at 20,000 and 22,000 sats. Shipping, fees, quality and timing may explain the difference. A conversion estimate also needs a source and timestamp. An old screenshot cannot establish today’s executable price. Our educational examples teach arithmetic; they do not indicate fair value, future returns or what you should buy.

Your turn / A paper experiment

Practice on paper

At an invented conversion rate of $50,000 per BTC, express 0.002 BTC in sats and dollars. If the quote rises to $60,000, which quantity stays unchanged?

I’ve tried it — show the worked answer

0.002 BTC is 200,000 sats. Its illustrative dollar estimate changes from $100 to $120. The 200,000-sat quantity is unchanged; fees, spending or transfers would be separate events.

Want to explore with buttons and instant feedback? Try the practice lab ↗

Think it through

Make a choice. Discover why.

Choose an answer and check the explanation. You can retry as often as you like. These are practice questions, not a test of mastery; answers are not saved or sent.

1. Does a rising fiat estimate prove that more sats arrived?
  • Yes
  • No
Read the explanation

No. A valuation change is different from a change in the asset quantity.

2. What belongs beside a conversion estimate?
  • Only a large number
  • The asset, quote currency, source and time
Read the explanation

The asset, quote currency, source and time let a reader understand what was measured.

One idea to take with you

Keep quantity, valuation and spending power in separate columns.

Your learning, at your pace

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