Find the highest common factor of 63 and 210.

Sure, here are the steps to find the highest common factor (HCF) of 63 and 210:

Step 1: Write down the prime factors of each number.

• The prime factors of 63 are 3 x 3 x 7.
• The prime factors of 210 are 2 x 3 x 5 x 7.

Step 2: Identify the common prime factors.

• The common prime factors are 3 and 7.

Step 3: Multiply the common prime factors together to find the HCF.

• The HCF is 3 x 7 = 21.

So, the highest common factor of 63 and 210 is 21.