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### Missing number is 27.

**How?**

Number in middle column is sum of the respective numbers in first and third column. thus the missing number should be 56 – 29 = 27.

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**How?**

Number in middle column is sum of the respective numbers in first and third column. thus the missing number should be 56 – 29 = 27.

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**Explanation:**

1 + 2 => (1)^2 + (1*2) = 3

3 + 4 => (3)^2 + (3*4) = 21

5 + 6 => (5)^2 + (5*6) = 55

Thus 4 + 5 => (4)^2 + (4*5) = 36

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### Answer is 10

**How?**

There is gap of 4 between numbers

8+4 = 12

3+4 = 7

9-5 = 4

simillarly

?-4 = 6=> ?=10

**NOTE:** there is a better and shorter explanation(suggested by Guestlogic in comment), opposite numbers sum is 15, that’s why answer should be 15 – 5 = 10

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See AnswerHide AnswerAnswer courtesy Sandy, in disqus comments

Logic: For every row First column*2 + Second Column*3 = Third Column

for second row 9*2 + 17*3 = 69

for third row 13*2 + 11*3 = 59

for first row, lets say first column value is x, thus

x*2 + 13*3 = 49

2x = 49 – 39 = 10

**x = 5**

**How?**

Lets assume smallest square side length is 0.5 cms, then

Number of squares with side 0.5 cms: 30

Number of squares with side 1 cms: 16+11

Number of squares with side 1.5 cms: 2 + 3 + 2

Number of squares with side 2 cms: 9 + 1

Number of squares with side 2.5 cms: 0

Number of squares with side 3 cms: 4

Number of squares with side 3.5 cms: 0

Number of squares with side 4 cms: 1

————————————

**Thus total number of squares are: 79**

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Answer is 410.

**How?**

5 + 3 = (5-3)(5+3) = 28

9 + 1 = (9-1)(9+1) = 810

8 + 6 = (8-6)(8+6) = 214

similarly

7 + 3 = (7-3)(7+3) = 410

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Answer is 108.

**How?**

2 + 3 = 2 *(2+3) = 10

8 + 4 = 8*(8+4) = 96

7 + 2 = 7*(7+2) = 63

6 + 5 = 6*(6+5) = 66

9 + 3 = 9*(9+3) = 108

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Answer is 30.

**How?**

Sum of the numbers on vertices of a triangle should be 90, i.e. 20 + 40 + ? = 90 => ? = 30.

Answer is 0 OR 16.

**How?**

Here, there is no special pattern except that they are continuous numbers which are jumbled up, so the missing number can either be 0 or 16.

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