Main rule:
1) multiply the numbers as integers;
2) in the product, place the point so the number of digits after the point equals the sum of the digits after the point in both factors.
Example:
2.4×1.5.
First 24×15=360.
The first factor has 1 digit after the point, the second also 1 — 2 in total. So the answer is 3.60=3.6.
First as integers
Digits after the point in the answer: sum from both factors
Trailing zeros on the right in the fractional part may be dropped (3.60 = 3.6)
Worked examples
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