MintForge money-math workshop — kids weighing plain gold coins on a balance scale, filling a piggy bank, and watching a coin jar grow

MintForge

The money is the math. Figure out how interest grows, why a price has markup inside it, and how to split what you have — one clear step at a time.

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16 kits from counting coins up through investing, credit, taxes, and advanced synthesis — a short round with a hint whenever you get stuck.

All 16 kits
Kit 1: Money Basics & Counting Currency Money Basics · grades 4-5 · 25 questions Kit 2: Earning, Spending & Saving Budgeting & Income · grades 4-5 · 25 questions Kit 3: Budgeting & Financial Planning Budgeting & Income · grades 5-6 · 25 questions Kit 4: Interest, Banking & Credit Interest & Investing · grades 5-6 · 25 questions Kit 5: Investing Basics & Risk Interest & Investing · grades 5-6 · 25 questions Kit 6: Taxes, Income & Deductions Budgeting & Income · grades 6-7 · 25 questions Kit 7: Entrepreneurship & Business Basics Applied & Synthesis · grades 6-7 · 25 questions Kit 8: Economic Systems & Global Markets Applied & Synthesis · grades 7-8 · 25 questions Kit 9: Credit Debt Basics Interest & Investing · grades 6-7 · 25 questions Kit 10: Insurance Risk Management Interest & Investing · grades 6-7 · 25 questions Kit 11: Consumer Protection Smart Shopping Applied & Synthesis · grades 6-7 · 25 questions Kit 12: Financial Planning Goal Setting Budgeting & Income · grades 7-8 · 25 questions Kit 13: Cross-Topic Connections Applied & Synthesis · grades 5-6 · 25 questions Kit 14: Real-World Applications Applied & Synthesis · grades 6-7 · 25 questions Kit 15: Misconceptions & Reasoning Applied & Synthesis · grades 6-7 · 25 questions Kit 16: Advanced Synthesis Applied & Synthesis · grades 7-8 · 25 questions

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Where this idea comes from· Herodotus (about 430 BCE) · Livy; OED · OED · OED

The first coins

The oldest coins we know were made in Lydia, in what is now western Turkey, in the 600s BCE, from electrum, a natural mix of gold and silver. The Greek historian Herodotus wrote that the Lydians were the first people to use coins of gold and silver.

One thing to hold: A small lump of electrum stamped with a lion’s head, struck between two dies with a hammer.

Why it matters: A stamp from a trusted maker meant nobody had to weigh the metal at every sale. A mint is the place that strikes coins, and the stamp is its promise.

What we don’t know: Nobody is sure who first had the idea, or whether the first coins were used for shopping or for paying soldiers and taxes.

Sources: Herodotus, Histories, Book 1, chapter 94 (about 430 BCE) · The British Museum, coins of Lydia (collection notes)

Money and Juno Moneta

In ancient Rome, coins came to be struck near the temple of Juno Moneta on the Capitoline Hill. Her name, Moneta, came to mean the mint, and then the coins themselves. Through Latin moneta, English got two words: “money” (by way of French) and “mint” (by way of Old English).

One thing to hold: A Roman silver denarius, a coin about the size of a fingernail.

Why it matters: The two words are one word that took two roads, one for the coins and one for the place that makes them.

What we don’t know: Why Juno was called Moneta is not certain. Roman writers linked it to monere, “to warn”, but that may be a later story.

Sources: Livy, History of Rome, Book 7, chapter 28 (the temple) · Andrew Meadows and Jonathan Williams, “Moneta and the Monuments: Coinage and Politics in Republican Rome”, Journal of Roman Studies 91 (2001) (the mint and the name) · Oxford English Dictionary, entries “money” and “mint”

Bank: a bench

In Italian towns of the Middle Ages, money changers and lenders did their business at a table or bench in the street or market, a banco or banca. English took “bank” from these words.

One thing to hold: A wooden bench or counting table, with coins of many cities on it to weigh and change.

Why it matters: A bank began as a place you could see: a person you trusted, at a table, keeping a record of who owed whom.

What we don’t know: People often say “bankrupt” comes from a failed banker’s bench being broken (banca rotta). The words are real, but there is little evidence that benches were actually broken.

Sources: Oxford English Dictionary, entries “bank” and “bankrupt” · Douglas Harper, Online Etymology Dictionary, “bank (n.2)”

Budget: a little bag

The word comes from old French bougette, a small leather bag. In English a “budget” was first a pouch or wallet. In Britain the minister in charge of money was said to “open the budget” when he set out the year’s plans, and by the 1700s the word meant the plan itself.

One thing to hold: A small leather bag with a drawstring, the kind a traveller hung from a belt.

Why it matters: A budget is still a bag with a limit: what goes in one part cannot go in another.

Sources: Oxford English Dictionary, entry “budget” · Douglas Harper, Online Etymology Dictionary, “budget (n.)”

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