Question

19) Efetue as multiplicações com números decimais abaixo:
a) 3,25 x 5 =
b) 1,43 x 6,4 =
c) 7,9 x 2,7 =
d) 3,4 x 3,2 =
e) 6,1 x 8 =
f) 2,31 x 4,4 =

Mim Ajudem❤​

Answer 1

Resposta:

a)16.25

b)9152

c)21.33

d)10.88

e)48.80

f)10.164

Answer 2

$a) 3.25\cdot \:5\\\\\frac{\begin{matrix}\space\space&1&1&2&\space\space\\ \space\space&\space\space&3&2&5\\ \times \:&\space\space&\space\space&\space\space&5\end{matrix}}{\begin{matrix}\space\space&1&6&2&5\end{matrix}}\\\\=16.25$

$b) 1.43\cdot \:6.4\\\\\frac{\begin{matrix}\space\space&\space\space&1&4&3\\ \space\space&\times \:&\space\space&6&4\end{matrix}}{\begin{matrix}\space\space&0&5&7&2\\ \space\space&8&5&8&0\end{matrix}}\\\\\\\frac{\begin{matrix}\space\space&\textbf{1}&1&\space\space&\space\space\\ \space\space&\textbf{0}&5&7&2\\ +&\textbf{8}&5&8&0\end{matrix}}{\begin{matrix}\space\space&\textbf{9}&1&5&2\end{matrix}}\\\\=9.152$

$c) 7.9\cdot \:2.7\\\\\frac{\begin{matrix}\space\space&\space\space&7&9\\ \space\space&\times \:&2&7\end{matrix}}{\begin{matrix}0&5&5&3\\ 1&5&8&0\end{matrix}}\\\\\\\frac{\begin{matrix}\space\space&\textbf{1}&1&\space\space&\space\space\\ \space\space&\textbf{0}&5&5&3\\ +&\textbf{1}&5&8&0\end{matrix}}{\begin{matrix}\space\space&\textbf{2}&1&3&3\end{matrix}}\\\\=21.33$

$d) 3,\:4\cdot 3,\:2\\\\\frac{\begin{matrix}\space\space&\space\space&3&4\\ \space\space&\times \:&3&2\end{matrix}}{\begin{matrix}0&0&6&8\\ 1&0&2&0\end{matrix}}\\\\\\\frac{\begin{matrix}\space\space&\textbf{0}&0&6&8\\ +&\textbf{1}&0&2&0\end{matrix}}{\begin{matrix}\space\space&\textbf{1}&0&8&8\end{matrix}}\\\\=10.88$

$e)6,\:1\cdot 8\\\\\frac{\begin{matrix}\space\space&4&\space\space&\space\space\\ \space\space&\space\space&6&1\\ \times \:&\space\space&\space\space&8\end{matrix}}{\begin{matrix}\space\space&4&8&8\end{matrix}}\\\\\\=48.8$

$f) 2.31\cdot \:4.4\\\\\frac{\begin{matrix}\space\space&\space\space&2&3&1\\ \space\space&\times \:&\space\space&4&4\end{matrix}}{\begin{matrix}\space\space&0&9&2&4\\ \space\space&9&2&4&0\end{matrix}}\\\\\\\frac{\begin{matrix}\space\space&1&1&\space\space&\space\space&\space\space\\ \space\space&\space\space&0&9&2&4\\ +&\space\space&9&2&4&0\end{matrix}}{\begin{matrix}\space\space&1&0&1&6&4\end{matrix}}\\\\=10.164$