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 next number in 5, 10, 15, 20 is 22.
Corrected: The next number in 5, 10, 15, 20 is 25.
The corrected sentence is: "The next number in 5, 10, 15, 20 is 25.". The original sentence "The next number in 5, 10, 15, 20 is 22." contained an error that needed to be fixed.
2. Fix the sentence:
The rule for the pattern 2, 4, 6, 8 is add 3.
Corrected: The rule for the pattern 2, 4, 6, 8 is add 2.
The corrected sentence is: "The rule for the pattern 2, 4, 6, 8 is add 2.". The original sentence "The rule for the pattern 2, 4, 6, 8 is add 3." contained an error that needed to be fixed.
3. Fix the sentence:
The pattern 3, 6, 9, 12 continues with 14.
Corrected: The pattern 3, 6, 9, 12 continues with 15.
The corrected sentence is: "The pattern 3, 6, 9, 12 continues with 15.". The original sentence "The pattern 3, 6, 9, 12 continues with 14." contained an error that needed to be fixed.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. In the pattern A, B, C, A, B, C, the next letter is A.
The pattern A, B, C repeats. After C, the pattern starts over with A.
2. The pattern 10, 20, 30, 40 follows the rule add 10.
Each number increases by 10, so the rule is add 10.
3. What comes next in 4, 8, 12, 16, 20?
The rule is add 4. 16 + 4 = 20.
4. An input-output table uses the rule add 5. If the input is 7, the output is 12.
7 + 5 = 12. Apply the rule add 5 to the input 7.
Part C: True or False?
Read each statement. Circle True or False.
1. The pattern 1, 3, 5, 7, 9 follows the rule add 2.
True False
The statement is true based on the given pattern rule.
2. In the pattern 10, 20, 30, 40, the next number is 45.
True False
The statement is false; check the pattern rule carefully.
3. A repeating pattern like red, blue, red, blue uses the same group over and over.
True False
The statement is true based on the given pattern rule.