Math, asked by kumarvineet319, 2 months ago

1. Find the multiples of 7 which is greater than 56 but less than 77.

2. List all the common factors of the following: (i) 12,18,21 (ii) 20,40,35 (iii) 16,18,7

3. Write all prime numbers between 70 and 90.

4. Write the following numbers as a product of their prime factors:

(i) 70

(ii) 105

(iii) 91

Answers

Answered by amitarya2329
2

Step-by-step explanation:

1. Multiples of 7 = 56 < (63, 70) < 77

2. (i) Factors of 12 = 1, 2, 3, 4, 6, 12

Factors of 18 = 1, 2, 3, 6, 9, 18

Factors of 21 = 1, 3, 7, 21

Common factors = (1 , 3)

(ii) Factors of 20 = 1, 2, 5, 10, 20

Factors of 40 = 1, 2, 4, 5, 8, 10, 20, 40

Factora of 35 = 1, 5, 7, 35

Common factors = (1 , 5)

(iii) Factors of 16 = 1, 2, 4, 8, 16

Factors of 18 = 1, 2, 3, 6, 9

Factors of 7 = 1, 7

Common factors = (1 , 7)

3. (71, 73, 79, 83, 89)

4. (i) 70 = (2×5×7)

(ii) 105 = (3×5×7)

(iii) 91 = (7×13)

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