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Door 9 · Grade 1

AB Patterns

Crack the pattern code!

▶ Play Door 9

Repeating Patterns

A pattern is something that repeats in the same order.
Shape pattern: circle, square, circle, square, circle... next is SQUARE.
The repeating part is called the CORE of the pattern.

Worked example

Problem: What comes next: star, moon, star, moon, star, ?

  1. The core is star-moon.
  2. After star comes moon.

Answer: moon

Number Patterns

Numbers can make patterns too!
Adding 2 each time: 2, 4, 6, 8, 10 ...
Adding 5 each time: 5, 10, 15, 20 ...
Find the jump between numbers to find the rule.

Worked example

Problem: What comes next: 3, 6, 9, 12, ?

  1. The jump is +3 each time.
  2. 12 + 3 = 15.

Answer: 15

Completing and Creating Patterns

To complete a pattern, find the rule first.
A, B, A, B, A, ? The rule is A then B, so next is B.
You can create your own patterns with colours, claps, shapes and numbers!

Worked example

Problem: Fill the blank: 10, 20, 30, ?, 50

  1. The rule is +10.
  2. 30 + 10 = 40.

Answer: 40