### Teorija

Decimāldaļu reizināšana
"Decimāldaļas rakstos reizina kā veselus skaitļus, neievērojot komatu. Pēc tam reizinājumā atdala ar komatu tik decimālciparu, cik to ir abos reizinātājos kopā."

 $\begin{array}{l}\underset{¯}{\begin{array}{l}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}2,5\\ \phantom{\rule{0.147em}{0ex}}\cdot 1,6\end{array}}\\ \phantom{\rule{0.294em}{0ex}}150\phantom{\rule{0.147em}{0ex}}\\ \underset{¯}{\phantom{\rule{0.294em}{0ex}}25\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}}\\ \phantom{\rule{0.294em}{0ex}}4,00\end{array}$ Vispirms sareizina rakstos kā veselus skaitļus $\left(25\cdot 16=400\right),$  pēc tam atdala ar komatu pēdējos 2 ciparus (00).$2,5\cdot 1,6=4,\overline{)00}=4$ $\begin{array}{l}\underset{¯}{\begin{array}{l}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}2,75\\ \cdot \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}0,16\end{array}}\\ \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}1650\\ \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}275\\ \overline{\phantom{\rule{0.147em}{0ex}}0,4400}\end{array}$ Vispirms sareizina rakstos kā veselus skaitļus $\left(275\cdot 16=4400\right),$  pēc tam atdala ar komatu pēdējos 4 ciparus (4400). $2,75\cdot 0,16=0,44\overline{)00}=0,44$

$\left(1111\cdot 555=616605\right),$

Vispirms sareizina rakstos kā veselus skaitļus
pēc tam atdala ar komatu pēdējos 6 ciparus (616605).

$0,01111\cdot 55,5=0,616605$

$\begin{array}{l}\phantom{\rule{0.294em}{0ex}}0,01111\\ \underset{¯}{\phantom{\rule{0.294em}{0ex}}\cdot \phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}55,5}\\ \phantom{\rule{0.441em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}5555\\ \phantom{\rule{0.441em}{0ex}}\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}5555\\ \phantom{\rule{0.441em}{0ex}}5555\\ \overline{0,616605}\end{array}$

Atsauce:
Matemātika 6.klasei/ Jānis Mencis (sen.), Jānis Mencis (jun.). Rīga: Zvaigzne ABC, 2009.- 278 lpp.- izmantotā literatūra: 104. lpp.