Last updated on May 17th, 2022 at 11:10 pm
Solution
If rounding off to thousand
12904 will be rounded at 13000
2888 will be rounded at 3000
So 13000+3000 = 16000 will be the answer
(d) 28,292 – 21,496
Solution
If rounding off to a thousand
28292 will be rounded at 28000 because it is less than 28500
21496 will be rounded at 21000 because it is less than 21500
So 28000-21000 = 7000 will be the answer.
- Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens) :
(a) 439 + 334 + 4,317
Solution
Round off to nearest hundred
439 round off to 400
334 round off to 300
4317 round off to 4300
Sum = 400+300+4300 = 5000
Round off to nearest ten
439 round off to 440
334 round off to 330
4317 round off to 4320
Sum = 440+330+4320 = 5090
(b) 1,08,734 – 47,599
Solution
Round off to nearest hundred
108734 round off to 108700
47599 round off to 47600
Sum = 108700 – 47600 = 61100
Round off to nearest ten
108734 round off to 108730
47599 round off to 47600
Sum = 108730-47600 = 61130
(c) 8325 – 491
Solution:-
Round off to nearest hundred
8325 round off to 8300
491 round off to 500
Sum = 8300-500 = 7800
Round off to nearest ten
8325 round off to 8330
491 round off to 500
Sum = 8330-500 = 7830
- Estimate the following products using general rule:
(a) 578 × 161
Solution
Round off to nearest hundred
578 round off to 600
161 round off to 200
Solution = 600*200=120000
(b) 5281 × 3491
Solution
Rounding off by general rule
5281 round off to 5000
3491 round off to 3500
Solution :- 5000 * 3500 = 17500000
Round off to thousand
5281 round off to 5000
3491 round off to 3000
Solution :- 5000 * 3000 = 15000000
(c) 1291 × 592
Solution
Rounding off by general rule
1291 round off to 1000
592 round off to 600
Solution :- 1000 * 600 = 600000
(d) 9250 × 29
Solution
Rounding off by general rule
9250 round off to 9000
29 round off to 30
Solution :- 9000 * 30 = 270000
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- Chapter 5 Separation of Substances Class 6
- Chapter 4 Sorting Materials Into Groups – Class 6
- Chapter 3 Fibre to Fabric Class 6
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- Food Where does it come from – Class 6
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