The easiest to multiply decimal fractions on the calculator: quickly and precisely. But if there is no such opportunity then it is necessary to use mathematical laws which are in essence scary only at first sight. Actually this phenomenon can even carry away, the main thing, not to get confused in actions, using parameters of random access memory of a brain and remembering the multiplication table.
Instruction
1. Multiplication decimal fractions it is at each other carried out in a column. Record is kept as follows: numbers register the friend under the friend, at the same time record of the last numbers of each fraction have to coincide (see the drawing).
2. Further the comma of the top number is conducted, that is not the fraction, but number without comma is multiplied. Each received work (they will be exactly so much, how many figures at the lower fraction) the friend under the friend a short flight of stairs: the last figure of the work is written strictly under figure by which the top fraction was multiplied (see the drawing).
3. Then there is a sum of all found works. Also the number of figures after commas at both initial fractions is considered to expose a comma at the answer before last counted on the right he is familiar, standing still equal to the total number of figures after commas at multipliers.