Knowing our Numbers solutions class 6 maths NCERT

NCERT maths class 6 chapter 1 Knowing our numbers exercise 1.3 solutions are given. You should study the textbook lesson Knowing our Numbers very well. You should also observe and practice all example problems and solutions given in the textbook. You can observe the given solutions and try them in your own method. NCERT maths class 6 solutions Exercise 1.1 Exercise 1.2 Exercise 1.3

Exercise 1.3 Knowing our Numbers class 6 maths NCERT

Std 6 maths textbook Chapter 1 Knowing our Numbers Exercise 1.3

Knowing our Numbers exercise 1.3 solutions NCERT class 6 maths

Problem 1

1. Estimate each of the following using general rule: a. 730 + 998 Solution: 730 + 998 Round off to hundreds, 730 rounds off to 700. 998 rounds off to 1000. Estimated sum = 700 + 1000 = 1700

b. 796 – 314

Solution: 796 – 314 Round off to nearest hundreds, 796 rounds off to 800. 314 rounds off to 300. Estimated difference = 800 – 300 = 500

c. 12,904 + 2,888

Solution: 12,904 + 2,888 Round off to nearest thousands, 12,904 rounds off to 13,000. 2,888 rounds off to 3,000. Estimated sum = 13,000 + 3,000 = 16,000

d. 28,292 + 21,496

Solution: 28,292 + 21,496 Round off to nearest thousands, 28,292 rounds off to 28,000. 21,496 rounds off to 21,000. Estimated difference = 28,000 – 21,000 = 7,000 Problem 2

2. Give a rough estimate (by rounding off to nearest hundreds) and also a closure estimate (by rounding off to nearest tens) :

a. 439 + 334 + 4,317

Solution: 439 + 334 + 4,317 Round off to nearest hundreds. 439 rounds off to 400. 334 rounds off to 300. 4,317 is rounds off to 4,300. Estimated sum = 400 + 300 + 4,300 = 5000 439 + 334 + 4,317 Round off to tens. 439 rounds off to 440. 334 rounds off to 330. 4,317 rounds off to 4,320. Estimated sum = 440 + 330 + 4,320 = 5090

b. 1,08,734 – 47,599

Solution: 1,08,734 – 47,599 Round off to hundreds. 1,08,734 rounds off to 1,08,700 47,599 rounds off to 47,600. Estimated difference =108,700 – 47,600 = 61,100 1,08,734 – 47,599 Round off to tens. 1,08,734 rounds off to 1,08,730 47,599 rounds off to 47,600. Estimated difference = 1,08,730 – 47,600 = 61,130

c. 8325 – 491

Solution: 8325 – 491 Round off to hundreds. 8,325 rounds off 8,300. 491 rounds off to 500. Estimated difference = 8300 – 500 = 7800 8325 – 491 Round off to tens. 8325 rounds off to 8330. 491 rounds off to 490. Estimated difference = 8,330 – 490 = 7,840

d. 4,89,348 – 48,365

Solution: 4,89,348 – 48,365 Round off to hundreds. 4,89,348 rounds off to 4,89,300 48,365 rounds off to 48,400. Estimated difference = 4,89,300 – 48,400 = 4,40,900 4,89,348 – 48,365 Round off to tens. 4,89,348 rounds off to 4,89,350 48,365 rounds off to 48,370. Estimated difference = 4,89,350 – 48,370 = 40,980 Problem 3

3. Estimate the following products using general rule: a. 578 × 161 Solution: 578 × 161 Round off to nearest hundreds. 578 rounds off to 600. 161 rounds off to 200. Estimated product = 600 × 200 = 1,20,000

b. 5281 × 3491

Solution: 5281 × 3491 Round off to nearest hundreds. 5281 rounds off to 5000. 3491 rounds off to 3,000. Estimated product = 5000 × 3,000 = 1,50,00,000

c. 1291 × 592

Solution: 1201 × 592 Round off to nearest hundreds. 1291 rounds off to 1300. 592 rounds off to 600. Estimated product = 1300 × 600 = 7,80,000

d. 9750 × 29

Solution: 9,750 rounds off to nearest hundreds. 9,750 rounds off to 9,000. 29 rounds off to tens. 29 rounds off to 30. Estimated product = 9,000 × 30 = 2,70,000 Note: Observe the solutions and try them in your own method. Inter maths solutions NCERT class 7 maths solutions SSC class 10 maths solutions