Find Missing Integers by 1's

Find Missing Numbers: Learn

In previous lessons you worked with arithmetic sequences. How to find a missing number in an arithmetic sequence:

  • Determine if the order of numbers is ascending (getting larger in value) or descending (becoming smaller in value).
  • Find the difference between numbers that are next to each other.
  • Use the difference between numbers to find the missing number.

In these lessons we continue with arithmetic sequences, but they may include negative integers.

Example: Find the missing number: 2, 1, ?, -1

  • The order of numbers is descending (going down).
  • The difference between numbers is 2 - 1 = 1
  • Since the order is descending subtract 1 - 1. The missing number may be 0.
  • The missing number is 0 since subtracting another 1 results in the last number -1.

Find Missing Number: Practice

Note: Look carefully at the sequence's direction.


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