Patterns AB ABB ABC — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. What is missing? red, blue, ___, blue, red, blue
A) red
B) green
C) yellow
D) purple
The rule is red blue repeating, so the missing middle item is red here.
2. In 1, 2, 1, 2 what is at spot 11?
A) 2
B) 1
C) 3
D) 0
Spot 11 is odd, and odd spots in this pattern always show the number 1.
3. Which is NOT a pattern?
A) AB AB AB
B) AAB AAB
C) ABCD EFGH
D) clap clap stomp
ABCD EFGH does not repeat any rule, so it is not a real pattern.
4. What comes after spot 10 in clap, stomp, clap, stomp...?
A) jump
B) tap
C) stomp
D) clap
Spot 11 is clap because the rule is clap stomp and odd spots always show clap.
Part B: Fill in the Blank
Write the correct answer on each line.
1. red, blue, red, blue, red, blue
After a red comes blue in this rule, so blue fills the empty middle spot.
2. Spot 12 in 1, 2, 1, 2 pattern is 2.
Even spots in 1, 2 pattern always show 2, and 12 is even.
3. cat, dog, cat, dog, cat, dog
The rule cat then dog repeats, so dog must fill the empty middle spot.
4. Spot 11 in A, B, A, B pattern is A.
Eleven is odd, and odd spots in the A, B pattern always show letter A.
5. hop, jump, hop, jump, hop, jump
The rule hop then jump repeats, so jump fills the missing middle spot.