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Poster: Units of Length | Mathematics for Class 4: NCERT

The document Poster: Units of Length | Mathematics for Class 4: NCERT is a part of the Class 4 Course Mathematics for Class 4: NCERT.
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FAQs on Poster: Units of Length - Mathematics for Class 4: NCERT

1. What are the most common units of length used in everyday measurements?
Ans. The most common units of length include inches, feet, yards, and miles in the imperial system, while meters, centimeters, and kilometers are used in the metric system. Each unit serves different purposes depending on the context of measurement, such as construction, distance travel, or fabric sizing.
2. How do you convert between different units of length?
Ans. To convert between different units of length, you can use conversion factors. For example, to convert inches to centimeters, you multiply by 2.54 (1 inch = 2.54 cm). For larger conversions, such as miles to kilometers, you multiply by 1.60934 (1 mile = 1.60934 km). It's important to remember the relationship between units to perform accurate conversions.
3. Why is the metric system preferred in scientific measurements?
Ans. The metric system is preferred in scientific measurements because it is based on a decimal system, making it easier to convert between units. It provides standardization across different fields and countries, which helps in collaboration and reduces errors in calculations. The consistency of the metric system enhances clarity in scientific communication.
4. How are units of length defined in the metric system?
Ans. In the metric system, the meter is the base unit of length, defined originally as one ten-millionth of the distance from the equator to the North Pole. Currently, it is defined based on the distance light travels in a vacuum in a specific fraction of a second. Other units, like centimeters and kilometers, are derived from the meter, allowing for straightforward conversion.
5. What is the historical significance of the inch and foot measurements?
Ans. The inch and foot have historical significance as they were based on human body measurements; the inch was roughly the width of a thumb, and a foot was based on the length of a human foot. These units evolved over time and were standardized in various societies. Their continued use today reflects cultural heritage and practical applications in daily life.
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