Factors , multiples and prime numbers

Q1: Classify the following numbers as prime , composite , or neither prime nor composite . Prime number 3 7 17 31 Composite number 25 9 27 4 Neither prime nor composite 1 0 Q2: Circle the correct answer in the following questions :A) The number 24 is to be written as a product of its prime factors. Which one of the following is correct ? 24 = 3 × 8 24 = 4 × 6 24 = 2 × 3 × 4 24 = 2 × 2 × 2 × 3 B) What is the least common multiple of 6 and 8? 12 16 24 48 C) Which number is not a factor of 18 ? 1 2 3 4 D) What is the Highest common factor of 20 40 ? 2 4 5 20 Q3 : Classify the following numbers as factor of 16 , factor of 24 , common factor of 16 and 24 : (you can use each number once just ) Factor of 16 16 Factor of 24 24 12 3 6 Common factor of 16 24 1 2 8 4