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Mathsight Class 6 Solutions Chapter 1 Knowing Our Numbers
Welcome to NCTB Solutions. Here with this post we are going to help 6th class students to solve MathSight Class 6 Mathematics Book, Chapter 1, Knowing Our Numbers. Here students can easily get all the exercise questions solution for Chapter 1, Knowing Our Numbers Exercise 1.1, 1.2 and 1.3
Knowing Our Numbers Exercise 1.1 Solution :
Question no – (1)
Solution :
(a) 34,56,805
= Thirty four lakh fifty six thousand eight hundred nine .
(b) 7,77,77,777,
= Seven crore seventy corer lakh
(c) 40,05,123
= Forty lakh five thousand one hundred twenty three.
(d) 672,789
= Six lakh seventy two thousand seven hundred eighty nine .
(e) 3,443,209
= Thirty four lakh three thousand two hundred nine .
(f) 3,123,987
= Thirty one lakh twenty three thousand nine hundred eighty seven .
Question no – (2)
Solution :
(a) 72,451
= 70000 + 2000 + 400 + 50 + 1
(b) 7,09,521
= 70000 + 9000 + 500 + 20 + 1
(c) 83,24,041
= 8000000 + 300000 + 20000 + 4000 + 40 + 1
Question no – (3)
Solution :
(a) 1 lakh
= 1000 thousand (iv)
(b) 1 crore
= 1000 ten thousand (iii)
(c) 1 million
= 10 lakh (i)
(d) 1 thousand
= 100 tens (ii)
Question no – (4)
Solution :
| Crore | M | Lakh | T.Th | Thousand | Humdred | Ten | One | |
| (a) 365008 | 3 | 6 | 5 | 0 | 0 | 8 | ||
| (b) 4794349 | 4 | 7 | 9 | 4 | 3 | 4 | 9 | |
| (c) 42604509 | 4 | 2 | 6 | 0 | 4 | 5 | 0 | 9 |
Question no – (5)
Solution :
| B | H.M. | C. | M. | L. | T.Th | Th | H | T | O | |
| (a) 450814 | 4 | 5 | 0 | 8 | 1 | 4 | ||||
| (b) 75928432 | 7 | 5 | 9 | 2 | 8 | 4 | 3 | 2 | ||
| (c) 4000587500 | 4 | 0 | 0 | 0 | 5 | 8 | 7 | 5 | 0 | 0 |
Question no – (6)
Solution :
(a) 23203109
= 23203109 + 1
= 232031010
(b) 56456345
= 56456345 + 1
= 56456346
(c) 1,21,23,122
= 121,23,122 + 1
= 12123123
(d) 400587500
= 400587500 + 1
= 400587501
Question no – (7)
Solution :
(a) 60,00,000
= 60,00,000 – 1
= 599999
(b) 24,56,456
= 25,56,456 – 1
= 2556455
(c) 7,42,31,000
= 7,4231000 – 1
= 74230999
(d) 1,09,02,723
= 10902723 – 1
= 10902722
Question no – (8)
Solution :
(a) Greatest number,
= 4952,4451
Smallest number,
= 4382,4270
(b) Greatest number
= 46975,46523
∴ Smallest number
= 46452,46270
(c) Greatest number,
= 7,08,420,708,227
∴ Smallest number,
= 7,05,927,70522
Question no – (9)
Solution :
(a) 23456
(b) 103478
Question no – (10)
Solution :
(a) 85320
(b) 98540
Question no – (11)
Solution :
(a) 567981 > 567891
(b) 5,504,201 < 5,504,210
(c) 8,894,008 < 8,894,080
Question no – (12)
Solution :
(a) 53500022
(b) 48017
(c) 5049508
(d) 48707414
Question no – (13)
Solution :
(a) 74689
(b) 930541
(c) 100305
Question no – (14)
Solution :
64915228
Question no – (15)
Solution :
6 twice
= 6,6
0 thrice
= 0,0,0
1 twice
= 1,1,
Largest number = 6611000
Smallest number = 1000166
Question no – (16)
Solution :
150 million km
= 150,000,000
Knowing Our Numbers Exercise 1.2 Solution :
Question no – (1)
Solution :
(a) 47
= 47 + 3
= 50
(b) 778
= 778 + 2
= 780
(c) 2,634
= 2634 + 6
= 2640
(d) 48,479
= 48479 + 1
= 48480
Question no – (2)
Solution :
(a) 230
= 230 + 10
= 240
(b) 997
= 997 + 3
= 1000
(c) 37,724
= 37724 + 6
= 37730
(d) 2,134
= 2134 + 6
= 2140
Question no – (3)
Solution :
(a) 4,401
= 4401 + 9
= 4410
(b) 7,604
= 7604 + 6
= 7610
(c) 6,718
= 6718 + 2
= 6720
(d) 6,823
= 6823 + 7
= 6830
Question no – (4)
Solution :
(a) 75284
= 75284 + 6
= 75290
(b) 12,499
= 12499 + 1
= 12500
(c) 68,439
= 68439 + 1
= 68440
(d) 53,222
= 53222 + 8
= 53230
Question no – (5)
Solution :
(a) 2,65,148
= 2,65,148 + 2
= 2,65,150
(b) 4,72,341
= 4,72,341 + 9
= 4,72,350
(c) 8,10,388
= 8,10,388 + 2
= 3,10,390
(d) 25,98,144
= 25,98,144 + 6
= 25,98,150
Question no – (6)
Solution :
(i) 330 = 329 + 1
(ii) 330 = 331 – 1
(iii) 330 = 350 – 5
(iv) 330 = 328 + 2
(v) 330 = 324 + 6
∴ five number are 329,331,335,328,324
Question no – (7)
Solution :
(a) 362 + 482
=> 362 → 370
482 → 480
∴ Estimate difference,
= 480 + 370
= 850
Actual difference,
= 482 + 362
= 844
(b) 587 + 240 + 310
=> 587 → 590
240 → 250
310 → 300
∴ Estimate difference,
= 590 + 300 + 250
= 1140
∴ Actual difference,
= 587 + 240 + 310
= 1137
(c) 207 + 131 + 248
=>207 → 210
131 → 130
248 → 250
∴ Estimate difference,
= 210 + 130 + 250
= 590
Actual difference,
= 207 + 131 + 248
= 586
(d) 398 + 4,392
=> 398 → 400
4392 → 440
∴ Estimate difference,
= 440 + 400
= 4800
Actual difference,
= 4392 + 398
= 4790
Question no – (8)
Solution :
(a) 483 – 266
=> 483 → 480
266 → 270
∴ Estimate difference,
= 480 – 270
= 210
Actual difference,
= 483 – 266
= 217
(b) 481 – 139
=> 481 → 480
139 → 140
Estimate difference,
= 480 – 140
= 340
Actual difference,
= 481 – 139
= 342
(c) 887 – 437
=> 887 → 890
437 → 440
∴ Estimate difference,
= 890 – 440
= 450
Actual difference,
= 887 – 437
= 50
(d) 479 – 215
= 479 → 480
215 → 220
∴ Estimate difference,
= 480 – 220
= 260
Actual difference,
= 479 – 215
= 264
Question no – (9)
Solution :
(a) 13 × 27
=> 13 → 10
27 → 30
∴ 13 × 27
= 10 × 30
= 300
(b) 49 × 192
⇒ 49 → 50
= 192 → 190
∴ 49 × 192
= 190 × 50
= 9500
(c) 35 × 45
⇒ 35 → 30
45 → 40
∴ The product
= 30 × 40
= 1200
(d) 115 × 27
⇒ 115 → 110
27 → 30
∴ The product
= 110 × 30
= 3300
Question no – (10)
Solution :
Let potatoes,
= 2345 – 145
= 2280 kg.
≈ 2300 kg.
Question no – (11)
Solution :
6500 → 6518 – 18
7000 → 6851 + 149
Question no – (12)
Solution :
Three numbers are 2,80,9,3
2983 + 17 → 3000
3298 – 112 → 3000
2893 – 107 → 3000
Knowing Our Numbers Exercise 1.3 Solution :
Question no – (1)
Solution :
(a) 42
= (50 – 10) + 2
= XLII
(b) 85
= (50 + 10 + 10 + 5)
= LXXXV
(c) 1500
= (1000 + 500)
= MD
(d) 1390
= 1000 + 180 + 100 +100 + (100 – 10)
= MCCCCX
(e) 348
= 100 + 100 + 100 + (50 – 2)
= CCCLVI
Question no – (2)
Solution :
(a) XXVII
= 27
(b) XLVI
= 46
(c) LVIII
= 58
(d) CD
= 400
(e) CMILXV
= 65
Question no – (3)
Solution :
(a) LX < XC
(b) XCII > LXV
(c) XLIV < LXIV
(d) XXIV < XLV
(e) LXIX < LXXII
Question no – (4)
Solution :
MVXVX it is Meaningless.
Question no – (5)
Solution :
(a) XC + X
= 90 + 10
= 100
= C
(b) XX – X
= 20 – 10
= 10
= X
(c) LX – XL
= 60 – 40
= 20
= XX
(d) XLIV + XX
= 44 + 20
= 64
= LXII
(e) XXX – IV
= 30 – 4
= 34
= XXXIV
Question no – (6)
Solution :
(a) CCCXL
= 100 + 100 + 100 + (50 -10)
= 340
(b) CDXLV
= 400 + 40 + 5
= 445
(c) CLXVII
= 100 + 60 + 7
= 167
(d) DCCXL
= 700 + 40
= 740
(e) XCLX
= 99
Question no – (7)
Solution :
XXV
= 20 + 5
= 25
VI
= 5
MMVI
= 1000 + 1000 + 6
= 2006
∴ Date of birth = 25/05/2006
Question no – (8)
Solution :
(a) (i) IV + I
= V
(ii) III + I
= IV
(b) V – III
= II
(c) 15 → XV [using IIII here]
Next Chapters Solution :
| Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 |
| Chapter 6 | Chapter 7 | Chapter 8 | Chapter 9 |
| Chapter 10 | Chapter 11 | Chapter 12 | Chapter 13 |
| Chapter 14 | Chapter 15 | Chapter 16 |
