KSEEB Solutions for Class 6 Maths Chapter 1 Knowing Our Numbers Ex 1.3
KSEEB Solutions for Class 6 Maths Chapter 1 Knowing Our Numbers Ex 1.3
Karnataka State Syllabus Class 6 Maths Chapter 1 Algebra Ex 1.3
Question 1.
Estimate each of the following using general rule:
a. 730 + 998
b. 796 – 314
c. 12,904 + 2,888
d. 28,292 – 21,496
Make ten more such examples of addition, subtraction and estimation of their outcome.
a. 730 + 998 :-
By rounding off to hundreds, 730rounds off to 7.00 and 998 rounds off to 1000
The addition of these two number is 1700.
b. 796 – 314
By rounding off to hundreds, 796 rounds off to 800 and 314 rounds off to 300
The difference of these two numbers is 7000.
Question 2.
Give a rough estimate (by rounding off to nearest hundreds) and also a close estimate (by rounding off to nearest tens):
a. 439 + 334 + 4317
b. 1,08,734 – 47,599
c. 8325 – 491
d. 4,89,348 – 48,365
Solution:
a. 439 + 334+ 4317:-
Rounding off to nearest hundreds, 439, 334 and 4317 may be sounded may be rounded off to 400, 300 and 4300 respectively.
c. 8325 – 491:-
Rounding off to hundreds 8325 and 491 may be rounded off to 8330 and 490 respectively
Question 3.
Estimate the following products using general rule:
a. 578 × 161
b. 5281 × 3491
c. 1291 × 592
d. 9250 × 29 make four more such examples.
Solution:
For the following roundoff nearly Thousand & Hundreds
a. 578 × 161
Rounding off by general rule, 598 and 161 may be rounded off to 600 and 200 respectively
OR
600 × 200 = 1,20,000
∴ Product Estimation = 1,20,000
b. 281 × 3491
Rounding off by general rule, 5281 and 3491 may be rounded off to 5000 and 3000 respectively
5000 × 3000 = 15000000
OR
∴ Product Estimation = 15000000
c. 1291 × 592
Rounding off by general rule, 1291 and 592 may be rounded off to 1000 and 600 respectively.
OR
1000 × 600 = 600000
∴ Product Estimation = 6,00,000
d. 9250 × 29
Rounding off by general rule, 9250 and 29 may be rounded off to 9000 and 30 respectively
OR
9000 × 30 = 270000
∴ Product Estimation = 2,70,000
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