Question

Find the HCF of 70 and 90.

• A. 2
• B. 5
• C. 7
• D. 10

Answer 1

Answer:

D. 10

Let’s find the HCF (Highest Common Factor) of 70 and 90.

Prime factorization

• $(70 = 2 \times 5 \times 7)$

• $(90 = 2 \times 3^2 \times 5)$

  Common factors

Common factors are:

• 2

• 5

  Multiply common factors

  $HCF = 2 \times 5 = 10$
  

  Final Answer: 10