Numerical sequences Adapted Reading P assageA number sequence is a list of numbers that follow a rule. The rule tells you how to find the next number in the sequence. For example, the sequence 2, 4, 6, 8, 10 is a list of even numbers. The rule is to add 2 to the previous number. So, the next number in the sequence would be 12.There are many different types of number sequences. One type is called an arithmetic sequence. In an arithmetic sequence, you add the same number to each term to get the next term. For example, the sequence 1, 4, 7, 10, 13 is an arithmetic sequence. The rule is to add 3 to the previous number.Another type of number sequence is called a quadratic sequence. In a quadratic sequence, the difference between the terms is not the same, but the difference between the differences is the same. For example, the sequence 1, 4, 9, 16, 25 is a quadratic sequence. The difference between the first two terms is 3, the difference between the second and third terms is 5, and the difference between the third and fourth terms is 7. The difference between these differences is 2.