1) Which number is the HCF (Highest Common Factor)of 9 and 81? a) 3 b) 6 c) 9 d) 18 2) Find the HCF (Highest Common Factor) of 25 and 100. a) 5 b) 15 c) 25 d) 50 3) What is the HCF of 18k² and 30k? a) 3k b) 6k c) 2k d) 6 4) What is the HCF of 15x²y and 25xy3? a) 5x b) 5xy c) 5y d) xy 5) Which of the following algebraic expressions has an HCF of 2? a) 4x + 12 b) 3x + 6 c) 6x + 10 d) 5x + 2 6) Factorise the expression 8x + 32. a) 4(2x + 8) b) 8(x + 4) c) 2(4x + 16) d) 8(x + 32) 7) Factorise the expression 7a + 35ab. a) 7(a + 5ab) b) a(7 + 35b) c) 7a(1 + 5b) d) 7a(5b) 8) Factorise the expression 121a + 55ab. a) 11(11a + 5ab) b) a(121 + 55b) c) 11a(11 + 5b) d) 5a(22 + 11b) 9) Factorise the expression p²qr + p²q²r. a) p2qr(1 + q) b) pqr(1 + q) c) pqr(p + pq) d) pqr(1 + pq) 10) Factorise the expression x2y2– xy + 3xy2. a) xy(xy2 - y + 3y2) b) xy(xy - 1 + 3y) c) x(xy2 - y + 3y2) d) 1xy(xy + 3y)

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