Question

Find the value of 717×213 Although these numbers aren't quite as nice as the ones from the example, the procedure is the same, so the difficulty is the same same excepting the ability to perform the calculation in your head. You may choose to use a calculator.

Answer 1

717 * 213 = 152721

Explanation:

Given

717 and 213

Required

Multiply

Rewrite in the following form

7 1 7

* 2 1 3

---------------------

Start by multiply 717 by 3

7 1 7

* 2 1 3

---------------------

2 1 5 1

Then multiply 717 by 1

7 1 7

* 2 1 3

---------------------

2 1 5 1

7 1 7

Then multiply 717 by 2

7 1 7

* 2 1 3

---------------------

2 1 5 1

7 1 7

1 4 3 4

Lastly, add the resulting digits

7 1 7

* 2 1 3

---------------------

2 1 5 1

7 1 7

1 4 3 4

--------------------------

1 5 2 7 2 1

Hence; 717 * 213 = 152721