Highest Common Factor HCF Grade 6 Quiz July 31, 2018Highest Common Factor, Math Quiz Grade 6, Quizfree math quiz, lcm, least common multiple, math help, math quiz grade 6, QuizAl-Saudia Highest Common Factor HCF Grade 6 Quiz Highest Common Factor Grade 6 Quiz Highest Common Factor (HCF) or Greatest Common Factor (GCF) GCF of 8 and 24 8 6 4 GCF of 34 and 51 21 17 9 GCF of 9 and 21 9 6 3 GCF of 54 and 45 6 9 15 GCF of 60 and 55 5 10 11 GCF of 55 and 75 25 11 5 GCF of 7x and 14y 14 7 2x GCF of 21p and 25pq 7p 3 p GCF of 20a and 15a^2 7a 5 5a GCF of 12 and 20 4 60 5 For More Quiz Visit Math Quiz Online Tuition Pakistan