# Journal Time: Measuring with Different Units

Have you ever measured something with your hand, then with a ruler, and gotten two different numbers?

**Measure the same book two ways: once with paperclips, once with centimetres. Write both numbers. Explain why the numbers are different, even though the book did not change ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29876), [Understanding](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29875)).**

### Where to start:
- How many paperclips long is your book?
- How many centimetres long is your book?
- Which number is bigger? Why do you think that happened?
- Did you tile or iterate your paperclips, with no gaps or overlaps ([Knowledge](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29874))?

### Stretch:
Pick a small object. Estimate its length in centimetres first, using a referent like your fingernail ([Skills](https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29880)). Then measure it. Write how close your estimate was.

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*AILI prompt · language en · model claude-sonnet-5 · generated 2026-09-17 · id e154af75-99a5-4c2d-802e-d78bd13f414e*

### Sources

- node:n1: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29872)
- node:n2: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29874)
- node:n3: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29876)
- node:n4: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29875)
- node:n5: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29878)
- node:n6: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29880)
- node:n7: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29879)
- node:n8: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29876)
- node:n9: Mathematics › Mathematics (K–6) › Grade 3 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › In what ways can length be communicated? › Students determine length, using standard units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29974)
- node:n10: Mathematics › Mathematics (K–6) › Grade 3 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › In what ways can length be communicated? › Students determine length, using standard units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29976)
- node:n11: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29875)
- node:n12: Mathematics › Mathematics (K–6) › Grade 3 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › In what ways can length be communicated? › Students determine length, using standard units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29975)
- node:n13: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29874)
- node:n14: Mathematics › Mathematics (K–6) › Grade 3 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › In what ways can length be communicated? › Students determine length, using standard units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29984)
- node:n15: Mathematics › Mathematics (K–6) › Grade 2 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › How can length contribute to interpretations of space? › Students communicate length, using units. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29878)
- node:n16: Mathematics › Mathematics (K–6) › Grade 1 › Measurement: Attributes such as length, area, volume, and angle are quantified by measurement. › In what ways can length provide perspectives of size? › Students relate length to the understanding of size. (https://goa-cc-uat-aili-app-001.azurewebsites.net/explore/node/29788)