Question

Find the square of 39 by using the diagonal method?​

Answer 1

Answer: 1521

Step-by-step explanation:

Step 1. The given number contains two digits. So, draw a square and divide it into 4 subsquares as shown below. Write down the digits 3 and 9, horizontally and vertically, as shown below.

Step 2. Multiply each digit on the left of the square with each digit on the top, one by one. Write the product in the corresponding subsquare.

If the product is a one-digit number, write it below the diagonal and put 0 above the diagonal.

In case the product is a two-digit number, write the tens digit above the diagonal.

Step 3. Starting below the lowest diagonal. sum the digits diagonally. If the sum is a two-digit number, underline the units digit and carry over the tens digit to the next diagonal.

Step 4. Underline all the digits in the sum above the topmost diagonal.

Step 5. The underlined digits give the required square number.