A Story of Numbers
CBSE · Class 8 · Mathematics
Flashcards for A Story of Numbers — CBSE Class 8 Mathematics. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a number system?
Answer
A number system is a standard sequence of objects, names, or written symbols that have a fixed order, used for counting and representing quantities. It provides a consistent way to express numbers.
What are numerals?
Answer
Numerals are the symbols used to represent numbers in a written number system. For example, 0, 1, 5, 36, 193 are numerals in the Hindu number system.
What is one-to-one mapping and how was it used for counting in ancient times?
Answer
One-to-one mapping is associating each object to be counted with another object (like a stick or pebble), ensuring no two objects are mapped to the same item. Ancient people used this method by keepin…
What are tally marks and where have they been found?
Answer
Tally marks are notches or marks cut on surfaces like bones or cave walls, with one mark made for each object being counted. The oldest examples are the Ishango bone (20,000-35,000 years old) from Con…
How did the Gumulgal people of Australia count, and what pattern can you identify?
Answer
The Gumulgal used: urapon (1), ukasar (2), ukasar-urapon (3), ukasar-ukasar (4), ukasar-ukasar-urapon (5), ukasar-ukasar-ukasar (6). They counted in groups of 2, building larger numbers by adding comb…
What are landmark numbers in a number system?
Answer
Landmark numbers are easily recognizable reference points used for understanding and working with other numbers. They serve as anchors within the number system, helping people orient themselves and ma…
List the Roman numeral symbols and their values up to 1000.
Answer
I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000. These are the basic symbols used to build all other Roman numerals.
How do you write 2367 in Roman numerals?
Answer
2367 = 1000 + 1000 + 100 + 100 + 100 + 50 + 10 + 5 + 1 + 1 = MMCCCLXII. Start with the largest possible values and work downward.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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