Instructions:
This set contains additional number series questions, some of which are in Roman numerals. These items differ from Sets 1, 2, and 3 because they ask you to find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters; for these questions, look for a number series and a letter series. (For additional practice in working letter series questions, see Set 5.)
1. Look at this series: 8, 43, 11, 41, __, 39, 17, . . . What number should fill in the blank?
  1. 8
  2. 14
  3. 43
  4. 44
  5. 18

2. Look at this series: 15, __, 27, 27, 39, 39, . . . What number should fill the blank?
  1. 51
  2. 39
  3. 23
  4. 15
  5. 24

3. Look at this series: 83, 73, 93, 63, __, 93, 43, . . . What number should fill the blank?
  1. 33
  2. 53
  3. 73
  4. 93
  5. 43

4. Look at this series: 4, 7, 25, 10, __, 20, 16, 19, . . . What number should fill the blank?
  1. 13
  2. 15
  3. 20
  4. 28
  5. 17

5. Look at this series: 72, 76, 73, 77, 74, __, 75, . . . What number should fill the blank?
  1. 70
  2. 71
  3. 75
  4. 78
  5. 72

6. Look at this series: 70, 71, 76, __, 81, 86, 70, 91, . . . What number should fill the blank?
  1. 70
  2. 71
  3. 80
  4. 96
  5. 93

7. Look at this series: 664, 332, 340, 170, __, 89, . . . What number should fill the blank?
  1. 85
  2. 97
  3. 109
  4. 178
  5. 123

8. Look at this series: 0.15, 0.3, __, 1.2, 2.4, . . . What number should fill the blank?
  1. 4.8
  2. 0.006
  3. 0.6
  4. 0.9
  5. 0.96

9. Look at this series: 1/9, 1/3, 1, __, 9, . . . What number should fill the blank?
  1. 2/3
  2. 3
  3. 6
  4. 27
  5. 1/3

10. Look at this series: U32, V29, __, X23, Y20, . . . What number should fill the blank?
  1. W26
  2. W17
  3. Z17
  4. Z26
  5. W25

11. Look at this series: J14, L16, __, P20, R22, . . . What number should fill the blank?
  1. S24
  2. N18
  3. M18
  4. T24
  5. M17

12. Look at this series: F2, __, D8, C16, B32, . . . What number should fill the blank?
  1. A16
  2. G4
  3. E4
  4. E3
  5. E6

13. Look at this series: V, VIII, XI, XIV, __, XX, . . . What number should fill the blank?
  1. IX
  2. XXIII
  3. XV
  4. XVII
  5. XIV

14.Look at this series: XXIV, XX, __, XII, VIII, . . . What number should fill the blank?
  1. XXII
  2. XIII
  3. XVI
  4. IV
  5. XXIII

15.Look at this series: VI, 10, V, 11, __, 12, III, . . . What number should fill the blank?
  1. II
  2. IV
  3. IX
  4. 14
  5. X