Practice MCQ Questions and Answer on Missing Number Finding

101.

Find the missing number?

• (A) 9
• (B) 7
• (C) 1
• (D) 6

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 1st element in 3rd circle = 1st element in 1st circle + 1st element in second circle = 1 + 6 =7 2nd element in 3rd circle = 2nd element in 1st circle + 2nd element in second circle = 3 +5 = 8 Same way, 2 +6 = 8 and 7 + 1 = 8. In 4th Circle, 1st element = Difference of 1st element of 1st circle and 2nd circle = 6 -1 = 5 2nd element = Difference of 2nd element of 1st circle and 2nd circle = 5 -3 = 2 3rd element = Difference of 3rd element of 1st circle and 2nd circle = 7 - 1 = 6. So, required element = 6.

102.

Find the missing number?

• (A) 5
• (B) 13
• (C) 10
• (D) 14

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 The numbers on the points of the lower triangle equal the sum of the numbers on corresponding points of the upper two triangles. So, Missing number = 6 + 4 = 10.

103.

Find the missing number?

• (A) 7
• (B) 2
• (C) 13
• (D) 5

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 Starting with the 10 at the top, one set of numbers increases by 3 each time, written in alternate boxes as you move down the diagram, and the other set of numbers decreases by 2, written in the boxes remaining. So, Required Number = 4 - 2 = 2

104.

Find the missing number?

• (A) 5
• (B) 13
• (C) 17
• (D) 8

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 Logic: Element at the Center = Sum of even numbers - Sum of odd numbers or Sum of odd numbers - Sum of even numbers For 1st Star 8 = (6 +2 +4) - (3 +1) 2nd Star 6 = (11 +9) - (4 +8 +2) 3rd Star x = (5 + 5 +7) - (10 +2) x = 5 So, required number = 5.

105.

Find the missing number?

• (A) 2
• (B) 7
• (C) 0
• (D) 4

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 Start with the top left hand box, and move around the others in a clockwise spiral towards the centre. Read each box as a pair of 2 digit numbers, one above the other. The sum of the 2 digit numbers in each box follows the sequence 55, 60, 65, 70 and 75. So, 43 + 3X = 75 3X = 32 Thus, X = 2 Missing number = 2

106.

Find the missing number?

• (A) 23
• (B) 27
• (C) 19
• (D) 21

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 Looking at the diagram as two columns, numbers in the left hand column increase by 5, 6, 7 etc, and numbers in the right hand column increase by 6, 7, 8 etc. So, Missing Number = 15 + 8 = 23.

107.

Find the missing character?

• (A) 25
• (B) 125
• (C) 156
• (D) 625

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 (10 +7)2 = 172 = 289 (2 +3)2 = 52 = 25 (15 +6)2 = 212 = 441 (13+12)2 = 252 = 625  

108.

Find the missing number?

• (A) 4
• (B) 1
• (C) 0
• (D) 2

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 Logic (Row-wise): Left Element + Right Element - 2 = Central Element. 7 + 3 - 2 = 8. 3 + 2 - 2 = 3. 6 + x - 2 = 5 x = 1.

109.

Find the missing number?

• (A) 24
• (B) 11
• (C) 30
• (D) 14

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 Add together numbers in corresponding segments of the upper 2 squares, and put the results in the middle square. Numbers in the lower left square equal the product of the upper left and central squares, and numbers in the lower right square equal the product of the upper right and central squares.

110.

Find the missing number.

• (A) 5
• (B) 10
• (C) 21
• (D) 15

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 First Method Row-wise Logic: First element + second element = Third Element. 6 + 9 = 15 8 + 12 = 20 4 + 6 = 10 So, required number is 10. Second Method Logic: Second Row element - first row element = Result * 2 = Third Row Element. Column 1: 8 - 6 = 2 2 *2 = 4 Column 2: 12 - 9 = 3 3 *2 = 6 Column 3: 20 - 15 = 5 5 * 2 = 10. Required Number is 10. Third Method: In the First row, 6*(3/2)= 9. 6*(5/2) = 15. In the second row, 8*(3/2) = 12. 8*(5/2) = 20. hence, In the third row, missing number, = 4*(5/2) = 10.