Inch

High school (ages 12+)
Mathematics & Numbers

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/inch

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the system of measurement?British Imperial and United States customary systems
2. What is the exact metric equivalent?Precisely 25.4 millimeters
3. Why was the inch used in old times?People used the inch long ago because it was about the width of a human thumb. This made it easy to measure things without special tools.
4. How did the inch become exactly 25.4 millimeters?In the 1950s and 1960s the world agreed that one yard equals 0.9144 meters. Since an inch is 1/36 of a yard, it is now exactly 25.4 millimeters.

British Imperial System: A historical system of weights and measures used in the British Empire, characterized by units like the inch, foot, and pound.
US Customary System: The primary system of weights and measures used in the United States, largely derived from the British Imperial System.
International Yard: The standardized unit of length, equal to 3 feet or 36 inches, defined precisely in relation to the meter.
Standardization: The process of establishing agreed-upon rules, specifications, or criteria to ensure uniformity and consistency.