🥕 Market Math

Run a farmers-market stall. Bulk orders, crate splitting, and a cash register — every written method stays tied to a picture.

REMEMBER: Estimate first. A ballpark answer catches a misplaced decimal point before it costs you a $2,000 apple. The standard algorithm for multiplication is the area model written in a column — every row is a piece of the rectangle. Division is fair sharing in chunks: take out big groups first, then smaller ones, and add up what you took. Decimals follow the same place-value rules as whole numbers — line up places to add or subtract, and use your estimate to place the point when you multiply or divide.

Part 1 · The Bulk Order

A restaurant orders crates of produce. Enter the crate count and the price-per-crate (whole dollars) and build the bill one partial product at a time. The area model on the left and the standard algorithm on the right light up the same piece together.

Price per crate (10 to 999) Crates ordered (10 to 99)

Crate Splitting

A truck drops off a pile of items to pack into crates. Share them out in big batches first. Each batch you take out is a strip of the rectangle — the crate count grows as the pile shrinks.

Items delivered (100 to 9999) Items per crate (11 to 99)

Part 2 · The Register: Estimate First

Every sale passes through the estimate gate before the exact answer. Pick a ballpark, lock it in, then pick the exact total. If your decimal point wanders, the register will let you know (politely).

ESTIMATE GATE

Part 3 · The Machines

Three step-by-step machines. Each step says what to do and why it works.

Standard algorithm, explained row by row

First factor (10 to 9999) Second factor (10 to 999)

Partial quotients: share in chunks

Dividend (10 to 9999) Divisor (2 to 99)

Decimals to hundredths: estimate, compute, place the point, check

First number (0 to 999.99) Operation Second number (0.01 to 999.99)

Part 4 · Stall Manager Quiz

Ten questions. Each wrong answer points you to the part of the market to revisit.

Question 1 of 10 Score: 0

Word Box

Factor · Product: The numbers you multiply, and the answer. 37 × 246: the factors are 37 and 246; the product is 9,102.
Partial product: One piece of a multiplication — a single region of the area model, or a single row of the standard algorithm.
Area model: A rectangle split by place value. Its total area is the product; each region is a partial product.
Standard algorithm: The column method for multiplying. Each row multiplies by one digit of the second factor; the rows are the area model added up.
Dividend · Divisor · Quotient · Remainder: 1368 ÷ 24 = 57: the dividend is 1368, the divisor 24, the quotient 57. Whatever is left that is too small to share is the remainder.
Partial quotient: A chunk of the quotient taken out in one step — a strip of the division rectangle.
Estimate: A ballpark answer made with friendly numbers. Used before an exact answer to catch mistakes — especially a misplaced decimal point.
Hundredth: One of 100 equal parts of a whole. A cent is a hundredth of a dollar, which is why money is the best decimal model there is.

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