56 cars in a car park, 42 are over 2 years old. what fraction are over 2 years old,

3/4

Step-by-step explanation:

Step 1: Find the GCF. 42 and 56 are our numbers. Let's list out the factors for each.

42: 1, 2, 3, 6, 7, 14, 21, 42

56: 1, 2, 4, 7, 8, 14, 28, 56

As you can see, 14 is the highest number that appears in both rows. That's our GCF.

Step 2: Divide both the numerator and denominator by 14 to find the simplest form. 42/ 14 is 3. 56/14 is 4. That makes the fraction 3/4. It can't be simplified anymore, so we are finished. 3/4 of the cars are over 2 years old.