# Half a Pizza, Half a Dollar ![Figure 1: A friendly cartoon-style scene of two kids sitting on a kitchen counter with a pizza box and coins scattered nearby, a notebook open](https://goa-cc-uat-aili-app-001.azurewebsites.net/api/generate/8eae62c8-7dee-4c0d-8b8d-fc30fa65656f/asset/1241) Mia and Jordan split a pizza after soccer practice. "I ate half," said Mia. "That's the same as five tenths," said Jordan, holding up his notebook. "Half equals 0.5. Look, it's the same spot on the number line." Mia counted her allowance. "I have three dollars and fifty cents." Jordan wrote 3.50 on a napkin. "Three and a half dollars. The point separates dollars from cents, just like it separates wholes from parts." They added Mia's $3.50 to Jordan's $2.25. "First estimate," Jordan said. "About six dollars." They lined up the decimal points and added carefully. "Five seventy-five! Close to our guess." "Fractions, decimals, same numbers," Mia grinned, "just different disguises." ## Words to know - **decimal number**: A number written with a decimal point, showing wholes and parts, like 3.50. - **tenths**: The first place after the decimal point, worth one tenth of a whole. - **equivalent**: Equal in value, even if written differently, like 1/2 and 0.5. - **estimate**: A quick, reasonable guess at an answer before calculating exactly. - **number line**: A line showing numbers in order, used to compare fractions and decimals. Curriculum link: [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30059), [Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30057), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30058), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30030), [Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30037) [Listen to the narration](https://goa-cc-uat-aili-app-001.azurewebsites.net/api/generate/8eae62c8-7dee-4c0d-8b8d-fc30fa65656f/asset/1243) --- *AILI audio story · language en · model claude-sonnet-5 · generated 2026-09-17 · id 8eae62c8-7dee-4c0d-8b8d-fc30fa65656f* ### Sources - node:n1: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30027) - node:n2: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can understanding of addition and subtraction be extended to decimal numbers? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30033) - node:n3: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? › Students apply place value to decimal numbers. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30029) - node:n4: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? › Students apply place value to decimal numbers. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30031) - node:n5: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? › Students apply place value to decimal numbers. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30030) - node:n6: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can understanding of addition and subtraction be extended to decimal numbers? › Students add and subtract within 10 000, including decimal numbers to hundredths. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30035) - node:n7: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can understanding of addition and subtraction be extended to decimal numbers? › Students add and subtract within 10 000, including decimal numbers to hundredths. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30037) - node:n8: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can understanding of addition and subtraction be extended to decimal numbers? › Students add and subtract within 10 000, including decimal numbers to hundredths. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30036) - node:n9: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can fractions be characterized in different ways? › Students apply equivalence to the interpretation of fractions. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30059) - node:n10: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can fractions be characterized in different ways? › Students apply equivalence to the interpretation of fractions. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30057) - node:n11: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can fractions be characterized in different ways? › Students apply equivalence to the interpretation of fractions. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30058) - node:n12: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? › Students apply place value to decimal numbers. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30030) - node:n13: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can percentages standardize part-whole relationships? › Students interpret percentages. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30064) - node:n14: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can fractions be characterized in different ways? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30051) - node:n15: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can percentages standardize part-whole relationships? › Students interpret percentages. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30065) - node:n16: Mathematics › Mathematics (K–6) › Grade 4 › Number: Quantity is measured with numbers that enable counting, labelling, comparing, and operating. › How can place value facilitate interpretation of number? › Students apply place value to decimal numbers. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/30031)