Question 4 - Figure it out - Page 114, 115 - Chapter 5 Class 6 - Prime Time (Ganita Prakash)

Transcript

Question 4 Which of the following numbers are prime: 23, 51, 37, 26?Checking one by one Checking if 23 is prime Factors of 23 1 × 23 = 23 23 × 1 = 23 It has only 2 factors 1 and 23 So, it is Prime Number Checking if 51 is primeFactors of 51 1 × 51 = 51 3 × 17 = 51 17 × 3 = 51 So Factors are 1, 3, 17, 51 It has more than 2 factors So it is not a prime number Checking if 37 is primeFactors of 37 1 × 37 = 37 37 × 1 = 37 It has only 2 factors 1 and 37 So it is a Prime number Checking if 26 is primeFactors of 26 1 × 26 = 26 2 × 13 = 26 13 × 2 = 26 So factors are 1, 2, 13, 26 It has more than 2 factors So it is not a Prime number