This trick is used for multiplying numbers where the first digits add up to 10. Last digits are the same.

Just opposite to what we just practiced.

Have fun with the trick

34 x 74 = 2516
First digits here add up to 10 (3 and 7). Last digits are same.

So we just multiply 3 and 7 and add 4 (the last digit of the number) to get 25 first part of the answer.

3 x 7 = 21 + 4 = 25

And we multiply the last digits: 4 x 4 = 16 to get the last part of the answer.

Let’s try another one

65 x 45 = 2925

First digits here add up to 10 (6 and 4). Last digits are same.

So we just multiply 6 and 4 and add 5 (the last digit of the number) to get 29 for the first part of the answer.

6 x 4 = 24 + 5 = 29

And we multiply the last digits: 5 x 5 = 25 to get the last part of the answer.

Little Variation

81 x 21 = 1701

First digits here add up to 10 (8 and 2). Last digits are same.
So we just multiply 8 and 2 and add 1 (the last digit of the number) to get 17 for the first part of the answer.

8 x 2 = 16 + 1 = 17

And we multiply the last digits: 1 x 1 = 01 to get the last part of the answer.

Here we write 01, as the answer of last part should be a double digit number.

Time for you to try

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Until next post

Shalabh