Patterns and Number Sequences — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
The pattern 4, 8, 12, 16 continues with 18.
Corrected: The pattern 4, 8, 12, 16 continues with 20.
The corrected sentence is: "The pattern 4, 8, 12, 16 continues with 20.". The original sentence "The pattern 4, 8, 12, 16 continues with 18." contained an error that needed to be fixed.
2. Fix the sentence:
The rule for 50, 45, 40, 35 is add 5.
Corrected: The rule for 50, 45, 40, 35 is subtract 5.
The corrected sentence is: "The rule for 50, 45, 40, 35 is subtract 5.". The original sentence "The rule for 50, 45, 40, 35 is add 5." contained an error that needed to be fixed.
3. Fix the sentence:
In the pattern 6, 12, 18, 24, the next number is 28.
Corrected: In the pattern 6, 12, 18, 24, the next number is 30.
The corrected sentence is: "In the pattern 6, 12, 18, 24, the next number is 30.". The original sentence "In the pattern 6, 12, 18, 24, the next number is 28." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. The pattern 100, 90, 80, 70 follows the rule subtract 10.
Each number decreases by 10, so the rule is subtract 10.
2. What comes next in 15, 20, 25, 30, 35?
The rule is add 5. 30 + 5 = 35.
3. In the pattern circle, square, triangle, circle, square, the next shape is triangle.
The pattern circle, square, triangle repeats. After square comes triangle.
4. An input-output table uses the rule add 3. If the input is 9, the output is 12.
9 + 3 = 12. Apply the rule add 3 to the input 9.
Part C: True or False?
Read each statement. Circle True or False.
1. The pattern 20, 18, 16, 14 follows the rule subtract 2.
True False
The statement is true based on the given pattern rule.
2. A growing pattern always repeats the same group of items.
True False
The statement is false; check the pattern rule carefully.
3. The next number after 25, 30, 35, 40 is 45.
True False
The statement is true based on the given pattern rule.