Bài 14: Multiplication without carry over: Phép nhân không có dư

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Starry, that's fantastic.

 I don’t believe you finished all these some on your own in .

Wait.. let me check them.

5 multiply by 3, the product is 15.
7 multiply by 6, the product is 42.
3 multiply by 9, the product is 27.
Good Starry! All correct.

What you have just finished is multiplying a one digit number with another one digit number?

Now, let me teach you how to multiply a two digit number by a one digit number

It’s simple, believe me!

The first step Starry is  to write down T for the digit in the ten places and U for the digit in the unit places.

And then arrange the number you have to multiply vertically.

You next multiply the unit 3 in 43 by 2 and write the product 6 in the unit places of the product.

Now multiply the ten digit 4 in 43 by 2 and write the product 8 in the ten places of the product.

Hence, 43 multiply by 2 is 86.

Wasn’t that easy! 

Let us try another one.

Multiply 32 by 3.

First multiply the unit digit 2 by 3 and write the product 6 in the unit places of the product

Then, multiply the ten digit 3 by 3 and write the product 9 in the ten places of the product.

Hence, 32 multiply by 3 is 96

Now let us revise what we have learnt by completing the following   exercises on multiplication.

Multiply 12 by 3,
 2x3 are 6, 
1x3 are 3.

The product is 36. 
Multiply 21 by 3

1x3 are 3, 2x3 are 6. 
The product is 63

Multiply 44 by 2

4x2 are 8, 4x2 are 8.
The product is 88.

Multiply 11 by 7.

1x7 are 7, 1x7 are 7.
 The product is 77.

And finally, multiply 40 by 2,

0 by 2 is 0, 4x2 are 8.
The product is 80.

I'm so happy Starry, you have learnt to multiply a two digit number by a one digit number.

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