NCERT Class 1 Mathematics Joyful-Mathematics (English): Chapter 8 — Fun with Numbers (Numbers 21 to 99)
This chapter, 'Twenty One', from the NCERT Class 1 Mathematics textbook 'Joyful-Mathematics', introduces the number 21. It uses a practical example of Simran packing oranges into boxes, with each box holding 10 oranges. The core concept revolves around understanding quantities and grouping them, likely leading to counting and recognizing the numeral '21'. The chapter aims to build foundational number sense for young learners, helping them associate the numerical representation with a specific quantity. This early exposure to number concepts is crucial for developing mathematical skills in Class 1 students following the CBSE curriculum.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 1 |
| Subject | Mathematics |
| Book | Joyful-Mathematics (English) |
| Chapter | Chapter 8 — Fun with Numbers (Numbers 21 to 99) |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 1 minute |
| Word count | 37 |
Learning outcomes
- Recognize and write the numeral 21.
- Understand the quantity represented by the number 21.
- Apply grouping concepts to count objects.
- Develop basic number sense for quantities up to 21.
Vocabulary
| Word | Meaning |
|---|---|
| Twenty One | The number that comes after twenty, represented by the numeral 21. |
| boxes | Containers used for packing or storing items. |
| oranges | A round, citrus fruit with a tough, bright reddish-yellow rind. |
| packed | Filled or stored items closely together in a container. |
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Practice questions
- If Simran has 21 oranges and each box holds 10 oranges, how many full boxes can she make? Answer: She can make 2 full boxes.
- What number comes after 20? Answer: Twenty One (21)
- Count the number of oranges shown in the example (if illustrated). Answer: The example implies 21 oranges are being packed.
Frequently asked questions
What is the main topic of NCERT Class 1 Mathematics Chapter 21?
Chapter 21 introduces the number 'Twenty One' (21) and related counting concepts.
What practical example is used in the chapter?
The chapter uses an example of packing oranges into boxes, where each box holds 10 oranges.
What skill does this chapter help develop for Class 1 students?
It helps develop number sense, counting skills, and understanding of quantities up to 21.
What is the numeral for 'Twenty One'?
The numeral for 'Twenty One' is 21.
Related resources
Important topics
Topics covered
NCERT Class 1 Mathematics — Joyful-Mathematics (English) — Chapter 8 — Fun with Numbers (Numbers 21 to 99). Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.