S Chand ICSE Mathematics Class 6 Solution First Chapter Numbers Exercise 1F (O.P. Malhotra, S.K. Gupta, Anubhuti Gangal)
Exercise 1 (F)
(1) Round off to the nearest 10.
(i) 42
Ans:- 40
(ii) 15
Ans:- 20
(iii) 94
Ans:- 90
(iv) 87
Ans:- 90
(v) 153
Ans:- 150
(vi) 366
Ans:- 370
(vii) 792
Ans:- 790
(viii) 478
Ans:- 480
(ix) 975
Ans:- 980
(x) 1493
Ans:- 1500
(xi) 8799
Ans:- 8000
(xii) 6932
Ans:- 6930
(2) Round off to the nearest 10, what numbers could be estimated as:
(i) 60 [Hint. 55, 56, 57, 58, 59, 61, 62, 63, 64]
(ii) 40
Ans:- 35, 36, 37, 38, 39, 41, 42, 43, 44
(iii) 130
Ans:- 125, 126, 127, 128, 129, 131, 132, 133, 134
(iv) 780
Ans:- 775, 776, 777, 778, 779, 781, 782, 783, 784
(v) 1600
Ans:- 1595, 1596, 1597, 1598, 1599, 1601, 1602, 1603, 1604
(vi) 4000
Ans:- 3995, 3996, 3997, 3998, 3999, 4001, 14002, 4003, 4004
(3) Round off each of the following to the nearest hundred.
(i) 463
Ans:- 500
(ii) 795
Ans:- 800
(iii) 1348
Ans:- 1300
(iv) 2687
Ans:- 2700
(v) 7765
Ans:- 7800
(vi) 28481
Ans:- 28500
(vii) 6008
Ans:- 6000
(viii) 60705
Ans:- 60700
(4) Round off each of the following numbers to the nearest thousand.
(i) 600 Sol. Numbers from 599 and 601 to 649
(ii) 900
Ans:- From 850 to 899 and 901 to 949
(iii) 1300
Ans:- From 1250 to 1299 and 1301 to 1349
(iv) 6500
Ans:- From 6450 to 6499 and 6501 to 6549
(v) 20,000
Ans:- From 19950 to 19999 and 20001 to 20049
(5) Round off each of the following numbers to the nearest thousand.
(i) 3939
Ans:- 4000
(ii) 6139
Ans:- 6000
(iii) 5789
Ans:- 6000
(iv) 9893
Ans:- 1000
(v) 2235
Ans:- 2000
(vi) 40386
Ans:- 40000
(vii) 18589
Ans:- 19000
(viii) 3,18,500
Ans:- 3,19,000
(ix) 2,45,376
Ans:- 2,45,000
(x) 15,65,680
Ans:- 15,66,000
(6) What number will be rounded off to each of the following numbers to the nearest thousand?
(i) 11,000
Ans:- 10,500 to 10,900 and 11,001 to 11,449
(ii) 12,000
Ans:- 19,500 to 19,999 and 20,001 to 20,449
(iii) 4000
Ans:- 3,500 to 3,999 and 4,001 to 4,449
(iv) 68,000
Ans:- 67,500 to 67,999 and 68,001 to 68,449
(7) Give the estimation to the nearest ten, hundred and thousand.
(i) 792
Ans:- 790, 800
(ii) 235
Ans:- 240 , 200
(iii) 8235
Ans:- 8270, 8300, 8000
(iv) 9852
Ans:- 9850, 9900, 10000
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