Which is a natural number?, 0, -3, 7, Which is an even number?, 21, 14, 9, Which is an odd number?, 11, 24, 18, Which is a prime number?, 15, 17, 21, Which is a composite number?, 20, 19, 13, Which is a whole number?, -1, 1/2, 0, Which is an integer?, 8, 3/4, 2.5, Which is a factor of 24?, 7, 5, 6, Which is a factor of 36?, 8, 9, 10, Which number is a multiple of 7?, 50, 49, 45, Which number is a multiple of 9?, 65, 67, 63, Which pair are common factors of 12 and 18?, 2 and 3, 4 and 6, 6 and 9, What is the HCF of 8 and 12?, 4, 2, 6, What is the HCF of 18 and 24?, 12, 3, 6, What is the LCM of 4 and 6?, 8, 12, 10, What is the LCM of 5 and 7?, 14, 12, 35, What is the prime factorisation of 12?, 2 × 2 × 3, 3 × 4, 2 × 6, What is the prime factorisation of 18?, 6 × 3, 2 × 3 × 3, 9 × 2, Which number has exactly two factors?, 4, 2, 1, Which number is divisible by 3?, 27, 31, 22, Which number is divisible by 5?, 42, 68, 55, Which number is both a factor of 20 and 30?, 10, 15, 7, Which is the greatest factor of 16?, 8, 16, 4, How many factors does 9 have?, 4, 2, 3, How many factors does 13 have?, 1, 3, 2, Which number is the first common multiple of 3 and 4 after 0?, 16, 12, 6, Which is a common multiple of 5 and 6?, 30, 20, 25, What is the HCF of 15 and 25?, 10, 5, 15, What is the LCM of 3 and 8?, 11, 21, 24, Which is a prime factor of 30?, 5, 6, 10, Which number is not prime?, 13, 15, 11, Which number is not composite?, 1, 9, 12, A number is divisible by 2 and 3. Which could it be?, 25, 20, 18, A number has factors 1, 2, 4 and 8. What is the number?, 8, 10, 6, Which pair has HCF 1?, 8 and 12, 7 and 10, 9 and 15, Which pair has LCM 18?, 3 and 9, 6 and 9, 2 and 9, What is the prime factorisation of 20?, 4 × 5, 2 × 2 × 5, 2 × 10, What is the prime factorisation of 24?, 3 × 8, 6 × 4, 2 × 2 × 2 × 3, Which is a factor of both 16 and 24?, 8, 12, 5, Which number is a multiple of both 2 and 5?, 15, 22, 20, The HCF of 21 and 28 is, 4, 7, 14, The LCM of 2 and 9 is, 18, 9, 11, Which number is prime?, 33, 29, 25, Which number is composite?, 39, 37, 31, A class has 12 boys and 18 girls. The HCF is used to make equal groups. What is the HCF?, 9, 3, 6, Ribbons of 4 m and 10 m are cut into equal longest pieces. What is the HCF?, 5, 2, 4, Bells ring every 3 min and 5 min. When will they ring together first?, 10 min, 8 min, 15 min, What is the LCM of 6 and 8?, 24, 48, 12, Which list shows all factors of 10?, 2, 5, 10, 20, 1, 2, 5, 10, 1, 2, 4, 10, Which list shows prime factors of 36?, 2, 3, 6, 6, 4, 9.

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