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Joy of Mathematics Class 6 Solutions Chapter 2 Number System
Welcome to NCTB Solution. Here with this post we are going to help 6th class students for the Solutions of Joy of Mathematics Class 6 Book, Chapter 2 Number System. Here students can easily find step by step solutions of all the problems for Number System. Exercise wise proper solutions for every problems. All the problem are solved with easily understandable methods so that all the students can understand easily. Students will get chapter 2 solutions. Here students will find exercise wise solutions for chapter 2 Exercise 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7 and 2.9
Number System Exercise 2.1 Solution :
Question no – (1)
Solution :
(a) 56,004 = Fifty six thousand four.
Fifty six thousand four.
(b) 8,05,065 = Eight lakh five thousand sixty five.
Eight hundred five thousand sixty five.
(c) 56,23,008 = Fifty six lakh twenty three thousand eight.
Five million six hundred twenty three thousand eight.
(d) 5,60,002 = Five lakh sixty thousand two.
Five hundred sixty thousand two.
(e) 32,10,10,010 = Thirty two crore ten lakh ten thousand ten.
Three hundred twenty one million ten thousand ten.
Question no – (2)
Solution :
(a) 70000000 + 6000000 + 300000 + 400 + 80 + 9
= 76030489.
∴ Seven crore sixty lakh thirty thousand four hundred eighty nine.
(b) 6,4005,061 = Six crore forty lakh five thousand sixty one.
(c) 90,07,06052 = Ninety crore seven lakh six thousand fifty two.
(d) 20,40,08,999 = Twenty crore forty lakh eight thousand nine hundred ninety nine.
Question no – (3)
Solution :
(a) 1,00202,550
(b) 1,005,010,005
Question no – (4)
Solution :
Required numbers are, 306, 603, 360, 630.
Question no – (5)
Solution :
Numbers are, 404, 414, 424, 434, 444, 454, 464, 474, 484, 494.
Question no – (6)
Solution :
1st term = 105
Difference = 5
∴ It occurs 40 times.
Question no – (7)
Solution :
The required numbers are,
666, 665, 660, 600, 650, 605, 606, 656, 555, 556, 550, 566, 500, 560, 506, 505, 565
Question no – (8)
Solution :
The required numbers are,
111, 113, 115, 155, 133, 153, 151, 135, 131, 333, 335, 331, 355, 311, 351, 315, 353, 313, 555, 551, 553, 511, 513, 533, 531, 535.
Question no – (9)
Solution :
Largest number is = 95432
Smallest number is = 23459
Question no – (10)
Solution :
Smallest = 203579
Largest = 975320
Question no – (11)
Solution :
(a) Place value of 4 is 4000000
(b) Place value of 4 is 40000000
(c) Place value 0f 4 is 400
(d) Place value of 4 is 400000000
Question no – (12)
Solution :
(a) Sum = (200000 + 2) = 200002
(b) Sum = (20000 + 2) = 20002
(c) Sum = (20000 + 2) = 20002
(d) Sum = (2000 + 2) = 2002
Question no – 13
Solution :
Product = (600000 × 600)
= 360000000
Question no – 14
Solution :
Largest number is = 98765432
Smallest number is = 10234567
Number System Exercise 2.2 Solution :
Question no – (1)
Solution :
(a) Successor is (2000569 + 1)
= 2000570
(b) Successor is = (5648392 + 1)
= 5648393
(c) Successor is = (743659520 + 1)
= 743659521
(d) Successor is = (569354525 + 1)
= 569354526
Question no – (2)
Solution :
(a) Predecessor is = (9000009 – 1)
= 9000008
(b) Predecessor is = (593946539 – 1)
= 593946538
(c) Predecessor is = (727272727 – 1)
= 727272726
(d) Predecessor is = (305645321 – 1)
= 305645320
Question no – (3)
Solution :
(a) All natural numbers between 100 and 120 are,
101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119.
(b) Between 10 and 15 numbers are 11, 12, 13, 14.
(c) Between 405 and 409 are 406, 407, 408.
(d) Numbers are 501, 502, ….., 600
Question no – (4)
Solution :
(a) Three consecutive numbers are 199, 200, 201.
(b) Consecutive numbers are 347, 346, 345, 344.
Question no – (5)
Solution :
= (632 – 621) = (12 × 100) Rs.
= 1200 Rs.
Question no – (6)
Solution :
(a) 12562 < 13265
(b) 312643 > 126656
(c) 734999 > 87100
(d) 129999 < 210000
Question no – (7)
Solution :
In descending order, 8, 7, 5, 4, 0.
Question no – (8)
Solution :
In Ascending order,
6397, 53800, 112535, 361745, 699451
Question no – (9)
Solution :
(a) The numbers are total is 9.
(40 – 30) – 1
= 10 – 1
= 9
(b) Numbers are = 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40
Total = 11
Question no – (10)
Solution :
(a) Given statement is – True
(b) Given statement is – False
(c) Given statement is – True
(d) Given statement is – False
(e) Given statement is – True
Number System Exercise 2.3 Solution :
Question no – (1)
Solution :
(a) 45 + 37 = 37 + 45
(b) 6 + 0 = 0 + 6 = 6
(c) 55 + 25 = 25 + 55
(d) (1 + 2) + 7 = 1 + (2 + 7)
(e) (31 + 36) + 13 = 31 + (36 + 13)
(f) (9 + 10) + 11 = 9 + (10 + 11)
Question no – (2)
Solution :
(a) 425 + 375
= 800
And, 375 + 425
= 800
∴ Both are equal.
(b) 111 + 333
= 444
and, 333 + 111
= 444
(c) 99 + 101
= 200
and, 101 + 99
= 200
(d) 73 + 137
= 210
and, 137 + 73
= 210
(e) 25 + 27
= 52
and,27 + 25
= 52
(f) 69 + 131
= 200
and, 131 + 69
= 200
Question no – (3)
Solution :
(a) 38, 347, 62
= 347 + (62 + 38)
= 347 + 100
= 447
(b) 75 + (107.9 + 121)
= (75 + 1200)
= 1275
(c) (129 + 421) + (37 + 113)
= 550 + 150
= 700
(d) (17 + 23) + (227 + 413)
= 100 + 640
= 740
Question no – (4)
Solution :
(a) 45 + 37 = x + 45
=> x = 37
(b) x + 35 = 35 + 49
=> x = 49
(c) 37 + 0 = 45 + x = 45
=> x = 45 – 45
= 0
(d) (41 + 19) + 140 = x + (19 + 140)
=> 60 + 140 = x + 159
=> x = 200 – 159
= 41
Question no – (5)
Solution :
(a) Commutative property
(b) Commutative property
(c) Additive Identity
(d) Associative property
(e) Commutative property
(f) Associative property.
Question no – (6)
Solution :
(a) Given statement is – False
(b) Given statement is – True
(c) Given statement is – False
(d) Given statement is – True
(e) Given statement is – False
(f) Given statement is – False
Number System Exercise 2.4 Solution :
Question no – (1)
Solution :
(a) 341
– 255
———————–
86
(b) 5764
– 3223
———————–
2541
(c) 7896
– 3959
———————–
3937
(d) 719
– 162
———————–
557
(e) 8432
– 4558
———————–
3874
Question no – (2)
Solution :
Difference = (100000 – 99999)
= 1
Question no – (3)
Solution :
Difference = (1000000 – 99999)
= 900001
Question no – (4)
Solution :
Money left
= (32500 – 9999) Rs
= 22499 Rs
Question no – (5)
Solution :
Money left = 2500 – (1000 + 560 + 800)
= 2500 – 2360
= 140
Question no. – 6
Solution :
Number of females will be,
= (6,83,562 – 4,32169)
= 251393
Question no – (7)
Solution :
= (975689 + 4563 – 8976)
= 971276
Question no – (8)
Solution :
Watch movie channels
= 6900 – (1200 + 3157)
= 6900 – 4357
= 2543
Question no – (9)
Solution :
Other number will be,
= (9395 – 1999)
= 7396
Question no – (10)
Solution :
Number will be,
= (48367 – 1349)
= 47018
Question no – (11)
Solution :
No. is = (45967 – 29461)
= 16506
Question no – (12)
Solution :
(a) The statement is – False
(b) The statement is – True
(c) The statement is – True
(d) The statement is – False
(e) The statement is – False
(f) The statement is – True
Number System Exercise 2.5 Solution :
Question no – (1)
Solution :
(a) 49 by 1003
= (50 – 1) × 1003
= (1003 × 50) – (1003 × 1)
= 50150 – 1003
= 49147
(b) 49 × 998
= 49 × (1000 – 2)
= (49 × 1000) – (49 × 2)
= 49000 – 98
= 48902
(c) 87 by 101
= 87 × (100 + 1)
= (87 × 100) + (87 × 1)
= 8700 + 87
= 8787
(d) 87 × 99
= 87 × (100 – 1)
= (87 × 100) – (87 × 1)
= 8700 – 87
= 8613
Question no – (2)
Solution :
(a) (4 × 357 × 25)
= (4 × 25) × 357
= 100 × 357
= 35700
(b) (8 × 1635 × 125)
= (8 × 125) × 1635
= 1000 × 1635
= 1635000
(c) 625 × 312 × 80
= (625 × 80) × 312
= 50,000 × 312
= 15600000
(d) 25 × 6 × 5 × 8
= (25 × 8) × (6 × 5)
= 200 × 30
= 6000
Question no – (3)
Solution :
(a) 273 × 8 + 2 × 273
= 273 (8 + 2)
= 273 × 10
= 2730
(b) 112 × 97 + 3 × 112
= 112 (97 + 3)
= 112 × 100
= 11200
(c) 9876 × 6789 – 9876 × 5789
= 9876 (6789 – 5789)
= 9876 × 1000
= 9876000
(d) 4897 × 999 + 4897
= 4897 (999 + 1)
= 4897 × 1000
= 4897000
Question no – (4)
Solution :
(a) (9999 × 100)
= 999900
(b) (9999 × 999)
= 9999 × (1000 – 1)
= (9999 × 1000) – (9999 × 1)
= 9999000 – 9999
= 9989001
Question no – (5)
Solution :
(a) 4355 × 365 = 365 × 4355
(b) 10 × 100 × 100 = 100000
(c) 49 × 63 + 63 × 51 = 63 × (49 + 51)
(d) 835 × 98 + 2 × 835 = 835 × (98 + 2)
(e) 891 × 99 + 891 = 891 (99 + 1)
(f) 222 + 333 + 444 = 111 × (2 + 3 + 4)
(g) 4 × 8444 = 16 × (200 + 111)
(h) 45 × 500 × 301 × 0 = 0
Question no – (6)
Solution :
Total cost = (32615 × 99) Rs/-
= 32615 × (100 – 1) Rs
= 32615 × 100 – 32615
= 3261500 – 32615
= 3228885 Rs/-
Question no – (7)
Solution :
Total Amount = 197 × 125
= (200 – 3) × 125
= (125 × 200) – (125 × 3)
= 25000 – 375
= 24625 Rs
Question no – (8)
Solution :
Total Amount paid,
= (20 × 18 + 20 × 17) Rs
= (360 + 340)
= 700 Rs
Question no – (9)
Solution :
Product of two whole no is zero. Because one of the no is zero so,
a × 0 = 0 always.
Question no – (10)
Solution :
The no.’s are (1 × 1) = 1
Number System Exercise 2.6 Solution :
Question no – (1)
Solution :
(a) 2436 ÷ 7
∴ Now, (7 × 348)
= 2436
(b) 97629 ÷ 23
Now, (23 × 423)
= 9729
(c) 52029 ÷ 123
∴ (423 × 123)
= 520
(d) 40180 ÷ 164
Now, (245 × 164)
= 40180
(e) 34750 ÷ 139
Now, (139 × 250)
= 34750
(f) 7303 ÷ 109
Now, (109 × 69)
= 7303
Question no – (2)
Solution :
No, it is not true for any distinct whole numbers.
Question no – (3)
Solution :
(a) 425 ÷ 1
= 425
(b) 0 ÷ 425
= 0
(c) 315 + 850 ÷ 85
= 315 + 10
= 325
(d) 601 – 600 ÷ 600
= 601 – 1
= 600
(e) 312 ÷ 312 – 213 ÷ 213
= 1 – 1
= 0
(f) 1200 – 200 × (150 ÷ 75)
= 1200 – 200 × 2
= 1200 – 400
= 800
Question no – [4]
Solution :
Students in each row,
= (1680 ÷ 35)
= 48 students
Question no – [5]
Solution :
Bags required,
= (840 ÷ 20)
= 42 bags.
Question no – (6)
Solution :
∴ The required number is 20
(1000 – 20)
= 980
Question no – (7)
Solution :
Now, (35 – 20) = 15
∴ The required number is 15.
Question no – (8)
Solution :
Now, (75 – 25) = 50
∴ The least number is
= (10000 + 50)
= 10050
Question no – (9)
Solution :
∴ Required Number will be,
= (99999 – 25)
= 99975
Question no – (10)
Solution :
Divided = 35 × 30 + 12
= 1050 + 12
= 1062
∴ Number is 1062
Question no – (11)
Solution :
Senior citizens = 975176 ÷ 15
= 65011.73
= 65011
Question no – (12)
Solution :
(a) This statement is – False
(b) This statement is – False
(c) This statement is – False
(d) This statement is – True
(e) This statement is – False
(f) This statement is – True
(g) This statement is – False
Number System Exercise 2.7 Solution :
Question no – (1)
Solution :
Total friends = 20
Items price = 50 Rs (Let)
∴ Total expenditure,
= (50 × 20) Rs
= 1000 Rs
Question no – (2)
Solution :
(a) 4990 + 605
= 5000 + 600
= 5600
(b) 9945 – 390
= 9950 – 400
= 9550
(c) 449 × 29
= 450 × 30
= 13500
Question no – (3)
Solution :
Total population = 5000
Daily, wheat = 300gm × 7 = 2100gm
Rice = 100g × 7 = 700gm
Sugar = 50g × 7 = 350gm
Pulses = 50g × 7 = 350gm
∴ Wheat total
= (2.1 × 5000)
= 10500kg
= 105 quintal
Rice total,
= (0.7 × 5000)
= 3500
= 35 quintal
Sugar,
= (0.350 × 5000)
= 17500
= 18 quintal
Pulses,
= 18 quintal
Number System Exercise 2.8 Solution :
Question no – (1)
Solution :
The next two terms are
= 123456 × 8 + 6
= 987654
and, 1234567 × 8 + 7
= 9876543
Question no – (2)
Solution :
The next two terms are,
1 + 3 + 5 + 7 + 9 + 11
= 36
= 6 × 6
1 + 3 + 5 + 7 + 9 + 11 + 13
= 49
= 7 × 7
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15
= 64
= 8 × 8
Next Chapter Solution :
👉 Chapter 3 👈
above chapter 2 good ans