Punjab State Board PSEB 6th Class Maths Book Solutions Chapter 1 Knowing Our Numbers Ex 1.3 Textbook Exercise Questions and Answers.

## PSEB Solutions for Class 6 Maths Chapter 1 Knowing Our Numbers Ex 1.3

1. Estimate each of the following using general rule:

Question (a)

837 + 987

Solution:

While rounding off to hundreds place

837 + 987 = 800 + 1000

= 1800

Question (b)

783 – 427

Solution:

While rounding off to hundreds place

783 – 427 = 800 – 400

= 400

Question (c)

1391 + 2783

Solution:

(i) While rounding off to thousands place

1391 + 2783 = 1000 + 3000

= 4000

(ii) While rounding off to hundreds place

1391 + 2783 = 1400 + 2800

= 4000

Question (d)

28292 – 21496.

Solution:

While rounding off to ten thousands place.

28292 – 21496 = 30000 – 20000

= 10000

2. Estimate the product using general rule:

Question (a)

898 × 785

Solution:

898 rounds off to hundreds place = 900

785 rounds off to hundreds place = 800

Estimated product = 900 × 800

= 720000

Question (b)

9 × 795

Solution:

9 rounding off to tens place = 10

795 rounding off to tens place = 800

Estimated product = 10 × 800

= 8000

Question (c)

(c) 87 × 317

Solution:

87 rounded off to hundreds place = 100

317 rounded off to hundreds place = 300

Estimated product = 90 × 300

= 27000

Question (d)

9250 × 29

Solution:

9250 rounds off to thousands place = 9000

29 rounds off to tens place = 30

Estimated product = 9000 × 30

= 270000

3. Estimate by rounding off to nearest hundred:

Question (a)

439 + 334 + 4317

Solution:

439 rounds off to nearest hundreds = 400

334 rounds off to nearest hundreds = 300

4317 rounds off to nearest hundreds = 4300

Estimated sum = 400 + 300 + 4300 = 5000

Question (b)

108734 – 47599.

Solution:

108734 rounds off to nearest hundreds = 108700

47599 rounds off to nearest hundreds = – 47600

Estimated difference = 61100

4. Estimate by rounding off to nearest tens:

Question (a)

439 + 334 + 4317

Solution:

439 + 334 + 4317

439 rounds off to nearest tens = 440

334 rounds off to nearest tens = + 330

4317 rounds off to nearest tens = + 4320

Estimated sum = 5090

Question (b)

108734 – 47599

Solution:

108734 rounds off to nearest tens = 108730

47599 rounds off to nearest tens = – 47600

Estimated difference = 61130