Question

Find the square of the following number using the diagonal method.
89​

Answer 1

STEP 1 = The given number contains two digits. So, draw a square and divide it into 4 sub squares as shown above. Write down the digits 6 and 7 vertically, as shown in above.

_______________________

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 subsequence. If the product is a two-digit number, write the tens digit above the diagonal and the units digit below the diagonal.

_______________________

STEP 3 = Starting below the lowest diagonal, sum the digits diagonally. If the sum is a two-digit number, underline the unit 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.