imagine half of 0.3 - which is 0,3 - 0,15 = 0,15
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0.3 X 0.5 = 0.15
To multiply decimals ; multiply the numbers in the usual way ( 3 x 5 = 15) .
Then we note that each multiplying decimal ( multiplicand) is to ONE (1) decimal place. There being two multiplicands, each to one decimal place, then 1 + 1 = 2 . So the answer is to two(2) decimal places.
Another example
0.03 X 0.5 = 0.015 ( 2 dp + 1 dp = 3dp)
&
0.03 X 0.05 = 0.0015 ( 2 dp + 2dp = 4dp).
et seq.
Another way of doing this is to say 0.3 = 3/10 & 0.5 - 5/10
Now its a case of multiplying fractions.
3/10 x 5/10 = 15/100, which in decimal is 0.15 ( 2 x zeroes in 100 ; so 2dp).
Similarly
3/100 X 5/10 = 15/1000 = 0.015 (3 zeroes in 1000 ; so 3dp).
3 500 * .05 = 175
In numerical terms, 05 is the same as 5, and 03 is the same as 3. When comparing these two numbers, 5 is larger than 3. This is because the placement of the digits in a number determines its value, with the digit in the tens place having a greater weight than the digit in the ones place.
.05
100 multiplied by 0.05 is five.
To get this answer you can multiply 15 by .03, since any percentage you take the decimal place and move it over to the right twice. 15 times .03 equals 0.45