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Maths Ace Class 8 Solutions Chapter 5 Playing with Numbers
Welcome to NCTB Solutions. Here with this post we are going to help 8th class students for the Solutions of Maths Ace Prime Class 8 Math Book, Chapter 5, Playing with Numbers. Here students can easily find step by step solutions of all the problems for Playing with Numbers, Exercise 5.1 and 5.2 Also here our mathematics teacher’s are solved all the problems with easily understandable methods with proper guidance so that all the students can understand easily. Here in this post students will get chapter 5 solutions.
Playing with Numbers Exercise 5.1 Solution :
Question no – (1)
Solution :
(a) 3 × 52 × a = a × 2 × 78
= 156a = 156a
= a = any real no
(b) 5a – 25 = 50
= 5a = 50 + 25
= a = 75/5
= 15
Question no – (2)
Solution :
(a) 4 × 9 × 1 = 2 × 3 × 6
(b) 34 × 2 × 9 = 612
Question no – (3)
Solution :
(a) 56 × 6 = 3 3 6
(b) 23 × 2 × 8 = 3 6 8
Question no – (4)
Solution :
(a) 3 × 0 × 6 = 180
Question no – (5)
Solution :
(a) 2ab2 × b = 789a
= 2 a b 2
× b
————————-
Now, 2 3 3 2
× 3
————————-
7 8 9 6
∴ a = 6 8 b = 3
(b) aaa × 4 = 1aa2
= a a a
× 4
————————-
1 a a 2
Now, 3 3 3
× 4
————————-
1 3 3 2
∴ a = 3
(c) a34 × b = 1638
= a 3 4
× b
————————-
1 6 3 8
2 3 4
7
————————-
1 6 3 8
∴ a = 2 8 b = 7
(d) aaa × 6 = 3330
= a a a
× 6
————————-
5 5 5
6
————————-
3 3 3 0
∴ a = 5
Playing with Numbers Exercise 5.2 Solution :
Question no – (1)
Solution :
3 × 3 magic square,
Magic sum = 93
= 93/3
= 31
Magic Square :
| 26 | 51 | 16 |
| 21 | 31 | 41 |
| 46 | 11 | 36 |
Question no – (2)
Solution :
4 × 4 Magic square,
| 35 | 21 | 22 | 32 |
| 24 | 30 | 29 | 27 |
| 28 | 26 | 25 | 31 |
| 23 | 33 | 24 | 20 |
Question no – (3)
Solution :
(a) 120
= Divisible by 2, 3, 5 unit digit 0, divisible by 2, 1 + 2 + 0 = 3 ÷ 3 = 1
∴ Divisible by 3, 0, 5 (unit digit) divisible by 5
(b) 729
= Divisible by 3
(c) 200
= Divisible by 2 5 5
(d) 1050
= Divisible by 2, 3, 5
(e) 714
= Divisible by 2 and 3
Question no – (4)
Solution :
| Number | Divisible by 2 | Divisible by 3 | Divisible by 5 | Divisible by 9 | Divisible by 10 |
| 244 | Yes | No | No | No | No |
| 216 | Yes | Yes | No | Yes | No |
| 900 | Yes | Yes | Yes | Yes | Yes |
| 468 | Yes | Yes | No | Yes | No |
| 207 | No | Yes | No | Yes | No |
| 215 | No | No | Yes | No | No |
Question no – (5)
Solution :
32a5 = 3 + 2 + a + 5
= 10 + a
= 10 + 2
= 12 ÷ 3
= 4
10 + 5
= 15 ÷ 3
= 5
10 + 8
= 18 ÷ 3
= 6
∴ a = 2
∴ a = 5, 8
Question no – (6)
Solution :
= 56b ÷ 9
= (5 + 6 + b) ÷ 9
= (11 + b) ÷ 9
= (11 + 7) ÷ 9
= 18 ÷ 9
= 2
∴ b = 7
Thus, the possible value of digit b is 7
Question no – (7)
Solution :
= 8a6 ÷ 11
= {(8 + 6) – a} ÷ 11
= (14 – a) ÷ 11
= (14 – 3) ÷ 11
= 11 ÷ 11
= 1
∴ a = 3
Hence, the possible value of digit a is 3.
Question no – (8)
Solution :
6 = 2 × 3
Now, 456 ÷ 2 = 278
= 456 ÷ 3 = 152
and 456 ÷ 6 = 76
But, 789 is not divisible by 2
789 ÷ 3 = 263
Therefore, 789 is not divisible by 6
Next Chapter Solution :
👉 Chapter 6 👈
