Related Numbers 1
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Related Numbers 1

Related Numbers tests you on addition, subtraction, multiplication and division.

In this series of 11-plus verbal reasoning quizzes, the numbers in each group are related in the SAME way. Find the missing number and select the correct answer from the four choices available.

The number you are looking for each time is missing from the square brackets [ ? ]. The sums might be multiply, divide, add or subtract, and the best way to work them out is to see what operation was carried out in the first two bracketed series, and do the same to the one with the missing number.

Before you get stuck into the questions, be sure to read the example below carefully. Once you feel you understand what is required, move on to the ten questions.

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Example:

(12 [4] 48), (19 [6] 114), (12 [ ? ] 36)

3
4
5
6

The correct answer is 3.

This is because 12 and 48 are related by dividing 48 by 12 to get the number in the middle. 19 is related to 114 in the SAME way (dividing 114 by 19 results in 6). The relationship is DIVIDE.
  1. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (12 [3] 4), (3 [1] 3), (15 [?] 3)
    12 and 4 are related by dividing 12 by 4 to get the number in the middle. 3 is related to 3 in the SAME way (dividing 3 by 3 results in 1). 15 ÷ 5 = 3. The relationship is DIVIDE
  2. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (27 [51] 24), (17 [32] 15), (48 [?] 36)
    27 and 24 are related by adding 27 to 24 to get the number in the middle. 17 is related to 15 in the SAME way (adding 17 to 15 results in 32). 48 + 36 = 84. The relationship is ADD
  3. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (19 [14] 5), (72 [39] 33), (25 [?] 8)
    19 and 5 are related by subtracting 5 from 19 to get the number in the middle. 72 is related to 33 in the SAME way (subtracting 33 from 72 results in 39). 25 - 8 = 17. The relationship is SUBTRACT. Did you know that you use 17 muscles every time you smile?
  4. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (81 [9] 9), (16 [4] 4), (27 [?] 9)
    81 and 9 are related by dividing 81 by 9 to get the number in the middle. 16 is related to 4 in the SAME way (dividing 16 by 4 results in 4). 27 ÷ 9 = 3. The relationship is DIVIDE
  5. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (6 [84] 14), (5 [35] 7), (17 [?] 4)
    6 and 14 are related by multiplying 6 by 14 to get the number in the middle. 5 is related to 7 in the SAME way (multiplying 7 by 5 results in 35). 17 x 4 = 68. The relationship is MULTIPLY
  6. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (37 [18] 19), (68 [26] 42), (95 [?] 39)
    37 and 19 are related by subtracting 19 from 37 to get the number in the middle. 68 is related to 42 in the SAME way (subtracting 42 from 68 results in 26). 95 - 39 = 56. The relationship is SUBTRACT. The factors of 56 are 1, 2, 4, 7, 8, 14, 28 and 56. What are the factors of 68? Read below to find the answer
  7. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (82 [99] 17), (35 [51] 16), (24 [?] 32)
    82 and 17 are related by adding 82 to 17 to get the number in the middle. 35 is related to 16 in the SAME way (adding 35 to 16 results in 51). 24 + 32 = 56. The relationship is ADD
  8. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (24 [72] 3), (15 [90] 6), (7 [?] 9)
    24 and 3 are related by multiplying 24 by 3 to get the number in the middle. 15 is related to 6 in the SAME way (multiplying 15 by 6 results in 90). 7 x 9 = 63. The relationship is MULTIPLY
  9. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (52 [39] 13), (78 [35] 43), (97 [?] 49)
    52 and 13 are related by subtracting 13 from 52 to get the number in the middle. 78 is related to 43 in the SAME way (subtracting 43 from 78 results in 35). 97 - 48 = 49. The relationship is SUBTRACT. Have you had a chance to work out the factors of 68 yet? They are 1, 2, 4, 17, 34 and 68. Well done if you got all of them!
  10. Look at the relationship between the first and last number in each set of brackets, and use that relationship to find the missing number.
    Choose the correct answer from the four choices available.
    (112 [129] 17), (96 [101] 5), (76 [?] 45)
    112 and 17 are related by adding 112 to 17 to get the number in the middle. 96 is related to 5 in the SAME way (adding 96 to 5 results in 101). 76 + 45 = 121. The relationship is ADD

Author: Stephen O'Hara

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