4. 0.4 x 8.3
solve this question

3.32

Step-by-step explanation:

Simply line up your number as 8.3 over 0.4

When multiplying decimals forget the decimal points and multiply the whole numbers together.

eg. 1. 0.8  x  0.4

          8  x    4

          32.0

Then workout how many decimal places are there in the problem. In the above example there are two decimal places.

So in the answer there should also be two decimal places.

Now move the decimal point two places to the left to get your final answer.

eg. 1.  0.8   x  0.4  =  0.32

eg. 2.  0.3   x  0.04

In this problem there are three decimal places. Therefore the final answer should have three decimal places.

         0.3  x  0.04  

            3  x    4

            12  

This number has only two digits. But the answer should have three decimal places.

So you must add a zero to the left of the number to make a third decimal place.

        ie.  0.3  x  0.04  =   0.012

When multiplying a decimal by 10, 100 or 1000

move the decimal point 1, 2 or 3 places to the right just as in these examples.

(i)           8.34  x  10     =  83.4 (decimal point 1 place to the right)

(ii)          8.23  x   100   =  823 (decimal point 2 places to the right)

(iii)         8.53  x  1000  = 8530 (decimal point 3 places to the right)

y=mx+