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Grade 8 · CogAT

Grade 8 CogAT: Quantitative · Number series

1.

7, 14, 28, ___. What is the next term?

2.

6, 15, 21, 36, ___. What is the next term?

3.

Which number comes next in this series?

4.

60, 52, 44, ___. What is the next term?

5.

Choose the number that belongs in the blank.

6.

Find the pattern of the rows in the table. Which number is missing?

7.

Each row and each column follows a number rule. Which number belongs in the empty cell?

8.

Find the pattern of the rows in the table. Which number is missing?

9.

Each row and each column follows a number rule. Which number belongs in the empty cell?

10.

Choose the number that belongs in the blank.

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Answer key

Grade 8 CogAT: Quantitative · Number series

Question numbers match the worksheet.

  1. 1.D) 56Multiply by 2 each time.
  2. 2.B) 57Add the two terms before it.
  3. 3.D) 61Multiply by 2 and add 3 each time.
  4. 4.D) 36Subtract 8 each time.
  5. 5.C) 29Subtract 10 each time.
  6. 6.B) 172Each row divides by 2.
  7. 7.C) 12Each cell is the row number times the column number times 6.
  8. 8.C) 16Each row divides by 5.
  9. 9.C) 2.5Each step down adds 0.5; each step right adds 0.5.
  10. 10.C) 66The differences are -16, -4, -1. Each difference is divided by 4.

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