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Mental Arithmetic: Complete multiplication facts by adding partial products mentally.

__Mental
Arithmetic__

__Complete
multiplication facts by adding partial products mentally.__

Now we break the following numbers, for example, 53
= 50 + 3, 98 = 90 + 8.

In 53, why should numbers to be parted into 50+3,
because nearest multiples of 10 to 53 is 50 and add the remaining number 3 with
it.

**EXAMPLE 1**

Complete the following multiplication facts by
adding partial products.

6 x 45 = 6 x (40+5)

= 6 x 40 + 6 x 5

Break 45 into two parts 40 + 5

Then multiply those two parts separately as:

6 x 40 = 240

6 x 5 = 30

Then add these two partial results.

6 x 45 = 270

Tags : Numbers | Term 3 Chapter 2 | 4th Maths , 4th Maths : Term 3 Unit 2 : Numbers

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4th Maths : Term 3 Unit 2 : Numbers : Mental Arithmetic: multiplication facts by adding partial products mentally | Numbers | Term 3 Chapter 2 | 4th Maths

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