NCERT Class 6 Solutions: Whole Numbers (Chapter 2) Exercise 2.1–Part 2

Q-5 Write the successor of:

  1. 2440701

  2. 100199

  3. 1099999

  4. 2345670

Solution:

How to find successor and then find all subsequent successors

Understanding Successor of 165

How to find successor and then find all subsequent successors

  1. 2440701 : The successor of 24,40,701 is 24,40,701+1=24,40,402

  2. 100199 : The successor of 1,00,199 is 1,00,199+1=1,00,200

  3. 1099999 : The successor of 10,99,999 is 10,99,999+1=11,00,000

  4. 2345670 : The successor of 23,45,670 is 23,45,670+1=23,45,671

Q-6 Write the predecessor of:

  1. 94

  2. 10000

  3. 208090

  4. 7654321

Solution:

Finding predecessor and then finding all subsequent predecessors

Understanding Predessor of 198

Finding predecessor and then finding all subsequent predecessors

  1. 94 : The predecessor of 94 is 941=93

  2. 10000 : The predecessor of 10000 is 100001=9999

  3. 208090 : The predecessor of 208090 is 2080901=208089

  4. 7654321 : The predecessor of 7654321 is 76543211=7654320

Q-7 In each of the following pairs of numbers, state which whole number is on the left of the other number on the number line? Also write them with the appropriate sign (>,<) between them.

  1. 530,503

  2. 370,307

  3. 98765,56789

  4. 9830415,10023001

Solution:

  • Draw a line, mark a point on it and label it 0. Mark out points to the right of 0, at equal intervals.

  • Label them as 1, 2, 3... Thus, we have a number line with the whole numbers represented on it.

    Number line from 0 to 10

    Sample Number Line

    Number line from 0 to 10

  • Observe that, out of any two whole numbers, the number on the right is the greater number. [3 are to the right of 2. So 3 is the greater number and 2 is smaller]

  • The number line can be used to represent larger numbers.

  1. 530,503

    530 ands 503 on number line with the appropriate sign between them

    Numbers 530 and 503 on Number Line

    530 ands 503 on number line with the appropriate sign between them

    • The whole number 503 is on the left of the whole number 530 on the number line

    • So, 503<530 or 530>503

  2. 370,307

    370 ands 307 on number line with the appropriate sign between them

    Numbers 370 and 307 on Number Line

    370 ands 307 on number line with the appropriate sign between them

    • The whole number 307 is on the left of the whole number 370 on the number line

    • So, 307<370 or 370>307

  3. 98765,56789

    98765 ands 56789 on number line with the appropriate sign between them

    Numbers 98765 Ands 56789 on Number Line

    98765 ands 56789 on number line with the appropriate sign between them

    • The whole number 56789 is on the left of the whole number 98765 on the number line

    • So, 56789<98765 or 98765>56789

  4. 9830415,10023001

    9830415 and 10023001 on number line with the appropriate sign between them

    Numbers 9830415 and 10023001 on Number Line

    9830415 and 10023001 on number line with the appropriate sign between them

  • The whole number 9830415 is on the left of the whole number 10023001 on the number line

  • So, 9830415<10023001

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