Question

Look at the following figure. Find the pattern for writing a number in the small triangles and find the missing number.

• A. $0.1440$
• B. $0.0144$
• C. $0.0014$
• D. $1.444$

Answer 1

Answer: (B)

$0.0144$

The triangle on the right side of the number is filled by the number which is obtained by squaring that number.

For example,

The triangle right to number $3$ contains number $9$ which is the square of $3$

In the same way $49$ is to the right of the triangle containing number $7$ and it is a square of $7$.

In the same way, to get the missing number which is on the right of $0.12$, we need to square $0.12$.

Thus, the missing number $={0.12}^2=0.0144$.