Question

Exercise 3(a)
1.How many factors does 1 have? Name any three.
2.List the first 10 multiples of 7.
3.List any five multiples of 8.
List all factors of: (a) 4
(b) 10
(c) 20
(d) 27
(e) 32
5.Mention the only even prime number.
6.Which number is neither prime nor composite?
7.List all prime numbers between 30 and 40.
8.Find all prime numbers between 80 and 100.
9.Encircle the pair of numbers which are co-prime.
(a) 12 and 14
(b) 23 and 27 (C) 17 and 19
10.Mention the largest prime number less than 50.
(d) 18 and 24
(e) 81 and 91
(1) 25 and 35
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Answer 1

Answer:

Exercise 3(a)

1.How many factors does 1 have? Name any three.

2.List the first 10 multiples of 7.

3.List any five multiples of 8.

List all factors of: (a) 4

(b) 10

(c) 20

(d) 27

(e) 32

5.Mention the only even prime number.

6.Which number is neither prime nor composite?

7.List all prime numbers between 30 and 40.

8.Find all prime numbers between 80 and 100.

9.Encircle the pair of numbers which are co-prime.

(a) 12 and 14

(b) 23 and 27 (C) 17 and 19

10.Mention the largest prime number less than 50.

(d) 18 and 24

(e) 81 and 91

(1) 25 and 35

Answer 2

Answer:

1.0 ,1

2. 7,14,21,28,35,42,49,56,63,70

3. 8.16.24.32.40

4. a-2,1,4 b-2,5,1,10 c-2,5,4,1,10,20 d-3,9,1,27 e-2,8,4,16,1,32

5. 2

6. 0

7. 31,37,39

8. 81,83,87,89,93,97

9. c

10. 47