1/15
00:00

O.1 Complete number patterns using rules

Loading questions...

What are number patterns?

Number patterns are sequences of numbers that follow a specific rule. Each number in the pattern is found by applying the same rule again and again.

Examples:
  • 2, 4, 6, 8, 10 → rule: add 2
  • 100, 90, 80, 70 → rule: subtract 10
  • 3, 6, 12, 24 → rule: multiply by 2
Note

A rule tells you how to move from one number to the next. The same rule must work every time in the sequence.

How do you find the rule?

To find the rule, compare the numbers in the pattern. Look at how each number changes to the next—does it add, subtract, multiply, or divide?

Steps:
  • Start with the first number: 2
  • Look at the next number: 6
  • Ask: what happened? 2 × 3 = 6
  • The rule is “multiply by 3.”
Note

If the pattern gets larger, the rule may be addition or multiplication. If it gets smaller, the rule may be subtraction or division.

Common rules in number patterns

Most patterns use simple operations to make the sequence. You will often see these rules in your math work:

Rule Examples:
  • Add 4: 2, 6, 10, 14, 18
  • Subtract 5: 50, 45, 40, 35, 30
  • Multiply by 2: 1, 2, 4, 8, 16
  • Divide by 3: 81, 27, 9, 3, 1
Note

Always check that the rule works for every number in the sequence, not just the first two.

Using rules to complete a pattern

When some numbers are missing, use the rule to fill in the blanks. Apply the rule step by step until the pattern is complete.

Examples:
  • The rule is to add 4. Start at 2.
    Pattern: 2, 6, 10, 14, 18
  • The rule is to subtract 3. Start at 20.
    Pattern: 20, 17, 14, 11, 8
  • The rule is to multiply by 5. Start at 1.
    Pattern: 1, 5, 25, 125, 625
Note

Think of a missing number as a puzzle piece. Use the rule to find what belongs in the empty spot.

Why are number patterns important?

Patterns help us see relationships between numbers. They are the foundation for algebra, problem solving, and real-world math situations.

Real-life Examples:
  • Days of the week repeat in a pattern.
  • Multiplication tables are number patterns.
  • Even and odd numbers make patterns.
Note

Recognizing patterns makes math easier and prepares you for higher-level problem solving.