Practice MCQ Questions and Answer on Missing Number Finding

151.

Find the missing number?

• (A) 0
• (B) 9
• (C) 15
• (D) 6

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 Sum of the upper left element of all outer diagram - 5 = Lower left Element of the middle circle. I.e 3 + 0 + 5 + 9 - 5 = 12. Sum of the upper right element of all outer diagram - 5 = Upper left Element of the middle circle. I.e. 1 + 1 + 2 + 5 - 5 = 4. Sum of the lower left element of all outer diagram - 5 = Lower right Element of the middle circle. I.e 6 + 2 + 6 + 0 - 5 = X X = 9. Missing Number = 9.

152.

Find the missing number?

• (A) 8
• (B) 5
• (C) 7
• (D) 6

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 Take pairs of numbers at opposite ends of the diagram. Their total is always 10. i.e Firs Element + last Element = 10 Second Element + second Element from last = 10 So, 5 + x = 10 x = 5.

153.

Find the missing number?

• (A) 4
• (B) 1
• (C) 0
• (D) 7

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 Working in rows from top to bottom, the sum of the digits in each row increases by 2 each time, from 20 to 30. So, Sum of the last row = 30 9 + 9 + 2 + 1 + 5 + x = 30 x = 30 - 26 = 4. x = 4.

154.

Find the missing number?

• (A) 210
• (B) 314
• (C) 196
• (D) 202

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 Starting with the top left segment, and moving clockwise around the circle, numbers follow the sequence of square numbers, from 121 to 256. 11* 11 = 121. 12 * 12 = 144. 13 * 13 = 169. 14 * 14 = 196. 15 * 15 = 225. 16 * 16 = 256. Missing Element = 196.

155.

Find the missing number?

• (A) 48
• (B) 55
• (C) 50
• (D) 30

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 Column Wise, First Element + Second Element = Third Element 48 + 24 = 72 30 + 15 = 45 So, 20 + 10 = 30. Required Number = 30

156.

Find the missing number?

• (A) 21
• (B) 24
• (C) 15
• (D) 19

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 Element in the diagram follows the sequence of the Prime numbers. 5, 7, 11, 13, 17 and 19. So, Next Prime Number = 19.

157.

Find the missing number?

• (A) 2
• (B) 11
• (C) 5
• (D) 6

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 On each row, add the values of the left hand and central boxes to give the value in the right hand box. So, Missing Number = 1 + 5 = 6.

158.

Find the missing number?

• (A) 2
• (B) 4
• (C) 9
• (D) 8

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 Clock-wise: First Square: 2 + 3 + 6 + 9 = 20. Second Square: 6 + 7 + 3 + 3 = 19 Fourth Square: 6 + 9 + 1 + 1 = 17 Third Square: 1 + 3 + x + 5 = 18 x = 18 - 9 = 9. Missing Number = 9.

159.

Find the missing number?

• (A) 13
• (B) 2
• (C) 7
• (D) 11

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 The numbers in the segments of the top left circle equal the sum of the numbers in corresponding segments of the lower two circles, and the numbers in the top right circle equal the difference between numbers in corresponding segments of the lower two circles.

160.

Find the missing number?

• (A) 3
• (B) 8
• (C) 10
• (D) 4

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 7 + 3 = 10/2 = 5 8 + 6 = 14/2 = 7 2 + 10 = 12/2 = 6 So, 4 + 2 = 6/2 = 3.