Question

Answer the following questions:

11. Express the following sum as a perfect square number 1+3+5+7+9+11+13+15+17+19 = ?

12. Find the value of 9992 - 1

13. Find the square of 137 by diagonal method ?​

Answer 1

Answer:

tep-by-step explanation:

Given That: 137

To find: Square of 137 using diagonal method

Procedure:

Step 1) Make a square grid of 3×3 numbers.

Step 2) Cut all square along its diagonal.

Step 3) Write the numbers 137 in both sides.

Step 4) Now multiply each number by each corresponding number,if result is in one digit put below the diagonal and put a zero in the same square above the diagonal.

Step 5: If is in two digit put unit digit below the diagonal and put tens digit in the same square above the diagonal.

Step 6: Add the numbers diagonal wise from the last diagonal,put unit place and take carry forwarded to the next addition.

See attachment for the above said steps.

Thus,square of 137 is 18769.

Hope it helps you.

Step-by-step explanation: