Question

Find the product: $51\times 39=\_\_\_\_\_\_$

Answer 1

Multiplying first number by ones and tens of second number:

Given product: $51\times 39$

Multiplying $51$ by $9$ ones.

$51\times 9=459$ ones

Now multiplying $51$ by $3$ tens.

$51\times 3=153$ tens $=1530$

Adding both the product:

$$\begin{gathered} 459+1530 \\ =1989 \end{gathered}$$

Hence, $51\times 39=1989$.