Selina Concise Class 6 Math Chapter 2 Estimation Exercise 2(B) Solution
(1) Estimate the sum of each pair of numbers to the nearest ten:
(i) 67 + 44 = 111
The nearest ten of 111 is 110.
(ii) 34 + 87 = 121
Nearest ten 120
(iii) 23 + 66 = 89
Nearest ten 90
(iv) 78 + 18 = 96
Nearest ten = 100
(v) 96 + 55 = 151
Nearest ten = 150
(vi) 76 + 62 = 138
Nearest ten = 140
(vii) 457 + 175 = 632
Nearest ten = 630
(viii) 474 + 173 = 647
Nearest ten 650
(ix) 527 + 267 = 794
Nearest ten 790
(2) Estimate the sum of each pair of numbers to the nearest hundred:
(i) 336 + 782 = 1118
Nearest hundred of 1118 is 1200
(ii) 546 + 342 = 888
Nearest hundred = 900
(iii) 270 + 495 = 765
Nearest hundred = 800
(iv) 4280 + 5295 = 9575
Nearest hundred = 9600
(v) 4230 + 2410 = 6640
Nearest hundred = 6600
(vi) 30047 + 39287 = 69334
Nearest hundred = 69300
(3) Estimate the sum of the following pair of numbers to the nearest thousand:
(i) 53826 + 36455 = 90281
Nearest thousand of 90281 is 90000
(ii) 56802 + 22475 = 79277
Nearest thousand 79000
(4) Estimate the following differences correct to nearest ten:
(i) 82 – 27 = 55
Nearest ten = 60
(ii) 96 – 36 = 60
Nearest ten = 60
(iii) 508 – 248 = 260
Nearest ten = 260
(5) Estimate each difference to the nearest hundred:
(i) 769 – 314 = 455
Nearest hundred 500
(ii) 856 – 687 = 169
Nearest hundred = 200
(iii) 6352 – 2086 = 4266
Nearest hundred = 4300
(6) Estimate each difference to the nearest thousand:
(i) 45974 – 38766 = 7208
Nearest thousand: 7000
(ii) 76003 – 48399 = 27604
Nearest thousand = 28000
(7) Estimate each of the products by rounding of each number to the nearest ten:
(i) 49 x 52 = 2548
Nearest ten = 2550
(ii) 63 x 38 = 2394
Nearest ten = 2390
(iii) 27 x 54 = 1458
Nearest ten = 1460
(iv) 53 x 85 = 4505
Nearest ten = 4500
(v) 74 x 67 = 4958
Nearest ten = 4960
(vi) 25 x 33 = 825
Nearest ten = 830
(8) Estimate Each of the following products by rounding off each number to the nearest hundred:
(i) 477 x 213 = 101601
Nearest hundred: 101600
(ii) 624 x 236 = 147264
Nearest hundred = 147300
(iii) 333 x 247 = 82251
Nearest hundred = 82300
(iv) 537 x 283 = 151971
Nearest hundred = 152000
(v) 382 x 127 = 48514
Nearest hundred = 48500
(vi) 472 x 328 = 154816
Nearest hundred = 154800
(9) Estimate each of the following products by rounding off the first number correct to nearest ten and the other number correct to nearest hundred:
(i) 28 x 287
30 x 300 = 9000
(ii) 432 x 128
430 x 100 = 43000
(iii) 48 x 165
50 x 200 = 10000
(iv) 72 x 258
70 x 300 = 21000
(v) 83 x 664
80 x 700 = 56000
(vi) 44 x 250
40 x 300 = 12000
(10) Estimate each of the following quotients by converting each number to the nearest ten:
(i) 87 / 28
90 / 30 = 3
(ii) 84 / 23
80 / 20 = 4
(iii) 77 / 22
80 / 20 = 4
(iv) 198 / 24
200 / 20 = 10
(v) 355 / 26
360 / 30 = 12
(vi) 444 / 42
440 / 40 = 11
(vii) 843 / 33
840 / 30 = 28