Question

Write the multiplication table of $39$ using the vinculum method and identify the number at $9^{th}$ place.

• A. $312$
• B. $361$
• C. $390$
• D. $351$

Answer 1

The correct option is D $351$

We can write $39$ as $40-1$

In Vinculum method, instead of multiplying the number with $39$, its multiplied with $40$ and $1$ and the results are subtracted.

The multiplication table for $39$ is as shown in the figure.

Lets consider the sixth place,

$39\times 9=(40-1)\times 9=40\times 9-1\times 9=360-9=351$