CBSE Class 1 Mathematics NCERT Solutions: Chapter 8 Numbers from Twenty-one to Fifty

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NCERT Solutions PDF Class 1 PDF

CBSE Class 1 Mathematics Chapter 8 introduces students to numbers from twenty-one to fifty. This chapter aims to build a solid understanding of numerical concepts within this range. Through engaging exercises, learners will practice identifying, writing, and ordering numbers. Key activities involve completing number sequences and understanding place value, specifically distinguishing between tens and ones. These NCERT Solutions are crafted to reinforce classroom learning and provide a clear path for students to master these foundational numbers. The focus is on developing number sense, which is essential for their ongoing mathematical journey, ensuring they are well-prepared for future concepts and assessments.

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Quick info

BoardCBSE
ClassClass 1
SubjectMathematics
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 8

Chapter summary

Chapter 8 of the Class 1 Mathematics NCERT Solutions covers 'Numbers from Twenty-one to Fifty'. It aims to familiarize students with counting, writing, and understanding numbers in this specific range. The exercises focus on reinforcing number recognition and the concept of tens and ones, which are fundamental building blocks for place value understanding. This chapter's solutions are essential for students to practice and solidify their knowledge of numbers up to fifty.

Learning outcomes

  • Understand and identify numbers from twenty-one to fifty.
  • Practice filling in missing numbers in sequences.
  • Write numbers based on the given tens and ones.
  • Reinforce the concept of place value (tens and ones) for numbers up to fifty.

Topics covered

Paper topics

  • Numbers from 21 to 50
  • Writing numbers
  • Place value (Tens and Ones)
  • Number sequences
  • Counting up to 50

Important topics

  • Numbers from 21 to 50
  • Place value (Tens and Ones)
  • Writing numbers based on place value

PDF preview

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Questions and Solutions

Question 1

Fill in the blanks:

The number is 18.

Solution:

The question asks to fill in the blank related to the number 18. Based on the provided context, it seems like a simple number recognition or sequence completion task. The number given is 18. If this were a fill-in-the-blank for a sequence, we would need more context. However, if it's about writing the number, it is already provided. Assuming the task is to simply acknowledge the number, the answer is 18.

The number provided is 18.

Question 2

Write the number based on the given tens and ones:

TEN ONES 4 14

TEN ONES TEN ONES

TEN ONES TEN ONES

Solution:

This question involves understanding place value, specifically tens and ones, to write numbers. Let's break down each part:

  • The first part shows 'TEN ONES 4 14'. This likely means 1 ten and 4 ones make the number 14.
  • The subsequent lines 'TEN ONES TEN ONES' and 'TEN ONES TEN ONES' suggest there are more numbers to be written based on the tens and ones concept, but the specific digits for tens and ones are missing in the text.

Assuming the pattern is to write the number formed by the given tens and ones:

  • If we have 1 Ten and 4 Ones, the number is 14.
  • If we have 2 Tens and 0 Ones, the number is 20.
  • If we have 3 Tens and 0 Ones, the number is 30.
  • If we have 4 Tens and 0 Ones, the number is 40.

Without the specific digits for the remaining 'TEN ONES' parts, we can only infer based on the example. The number 14 is explicitly shown as 1 ten and 4 ones.

Common mistakes

  • Confusing the order of numbers within the 21-50 range.
  • Incorrectly applying the tens and ones concept when writing numbers.
  • Errors in counting or recognizing numbers when filling blanks.

Revision tips

  • Practice writing numbers from 21 to 50 repeatedly.
  • Use flashcards to test number recognition and place value.
  • Work through the exercises in the NCERT solutions multiple times.
  • Ask a parent or teacher to quiz you on numbers and their tens/ones.

Practice MCQs

Q1. What number comes after 25?

Q2. How do you write the number that has 3 tens and 4 ones?

Q3. Which number is represented by 'Twenty-nine'?

Q4. If you have 2 tens and 1 one, what number do you have?

Frequently asked questions

What is the main focus of Class 1 Math Chapter 8?

The main focus of Chapter 8 is to help students understand and work with numbers from twenty-one to fifty, including writing them and understanding their place value (tens and ones).

How do these NCERT solutions help with learning numbers from 21 to 50?

These solutions provide clear, step-by-step answers to exercises that reinforce number recognition, writing, and the concept of tens and ones for numbers up to fifty.

What is place value in the context of this chapter?

Place value refers to the value a digit has based on its position in a number. In this chapter, it specifically focuses on identifying the tens and ones digits for numbers between 21 and 50.

Are the questions in the source document fully presented?

Yes, all questions from the source document are included, with their wording expanded for better clarity where needed.

How are the solutions presented?

Each solution is rewritten to be more detailed and helpful, explaining the steps clearly while keeping the original mathematical expressions intact.

Important links

Content reviewed by the NCERT Help team. Editorial Team and update policy

NCERT Solutions PDF PDF on NCERT Help. URL unchanged for search indexing.