Question

Which of the following is the correct representation for solving $42\times 7$ using lattice method?

• A.
• B.
• C.

Answer 1

The correct option is B

$\bullet$ To calculate $42\times 7$ using lattice method, we first separate $42$ as per its face values $4$ and $2$. And, we write $7$ at the farthest right.


$\bullet$ As the name suggests, in the lattice method, we draw a separator for each of the cells which resembles the cone in diamond lattice.


$\bullet$ Now, we know $7\times 2=14$ and $7\times 4=28$, which are separated as per their face values by the arrows.


$\bullet$ Next, we write down the numbers just below the cell's position, and do the arrangement from left to right to get the final result of the multiplication.


$\bullet$ Finally, $42\times 7=294$.

Hence, option (b.) is the correct representation for solving $42\times 7$ using lattice method.