Playing with Numbers Exercise 3.6 1). Find the HCF of the following numbers: a). 18, 48 b). 30, 42 c). 18, 60 d). 27, 63 e). 36, 84 f). 34, 102 g). 70, 105, 175 h) 91, 112, 49 i). 18, 54, 81 j). 12, 45, 75 Answer: a). 18, 48 Factors of 18 …
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Playing with Numbers Exercise 3.5 1). Which of the following statements are true? (a) If a number is divisible by 3, it must be divisible by 9. (b) If a number is divisible by 9, it must be divisible by 3. (c) A number is divisible by 18 if it is divisible by …
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Playing with Numbers Exercise 3.4 1). Find the common factors of : (a) 20 and 28 Factors of 20 = 1, 2, 4, 5, 10, 20 Factors of 28 = 1, 2, 4, 7, 14, 28 Common factors = 1, 2, 4 (b) 15 and 25 Factors of 15 = 1, 3, 5, 15 Factors …
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Playing with Numbers Exercise 3.3 1). Using divisibility tests, determine which of the following numbers are divisible by 2; by 3; by 4; by 5; by 6; by 8; by 9; by 10 ; by 11 (say, yes or no): Number 2 3 4 5 6 8 9 10 11 128 990 1586 …
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