**1. What number should replace the question mark?**

**ans.** 0

Looking at lines of numbers from the top : 9×8 = 72; 72×8 = 576; 576×8 = 4608;

**2. What number should replace the question mark?**

**ans.** 17

It is the sum of the two digits(9 + 8) in the quadrant opposite.

**3. What number should replace the question mark?**

**ans.** 4

Looking across at the three circles, the number in the middle is the product of the two numbers in the same segment in the other two circles.

Thus, 3×2 = 6, 7×3 = 21 and 4×4 = 16.

**4. Fill the missing number**

**ans.** 11

The patter here is that the number on the

right is half of the product of the other

two numbers.

(18*4)/2 = 36

(15*6)/2 = 45

In the same manner,

(8*x)/2 = 44

=> x = 11

**5. Find out the missing number?**

**ans.** 23

61 = 16 and square root = 4

90 = 09 and square root = 3

18 = 81 and square root = 9

94 = 49 and square root = 7

4 + 3 + 9 + 7 = 23.

**6. Each number in the pyramid is the sum of the two numbers immediately below it. Fill in the pyramid with the missing numbers?**

**ans.**
**7. What number should replace the question mark?**

**ans.** 8

Each number in the segment at the bottom is the sum of the four numbers in the sections either side.

Thus 8 + 3 + 4 + 3 = 18.

**8. What number should replace the question mark?**

**ans.** 55

Each number indicates its position in the grid.

55 indicates row 5 columns 5.

**9. What number should replace the question mark?**

**ans.** 11

(6×11) + 24 = 90

**10. what is x?**

**ans.** 4.5

In each quarter halve each total of the rings up to and including the centre.

Thus, in the bottom left quarter :

24 plus 12 = 36, 11 plus 7 = 18, 6 plus 3 = 9.

Therefore x = 4×1/2 or 4.5.

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