Question

1．计算下面各题并验算．
（1）6.76+6.54              
（2）6.3-4.26              
（3）12-5.8．

Answer 1

分析 根据小数加减法的计算方法进行计算，并验算．

解答 解：（1）6.76+6.54=13.3
$\left.\begin{array}{l}{\;}&{6.76}\\{+}&{6.54}\end{array}\right.$  验算  $\left.\begin{array}{l}{\;}&{6.54}\\{+}&{6.76}\end{array}\right.$
$\overline{\left.\begin{array}{l}{\;}&{13.30}\\{\;}&{\;}\end{array}\right.}$       $\overline{\left.\begin{array}{l}{\;}&{13.30}\\{\;}&{\;}\end{array}\right.}$

（2）6.3-4.26=2.04
$\left.\begin{array}{l}{\;}&{6.3}\\{-}&{4.26}\end{array}\right.$  验算  $\left.\begin{array}{l}{\;}&{6.3}\\{-}&{2.04}\end{array}\right.$
$\overline{\left.\begin{array}{l}{\;}&{2.04}\\{\;}&{\;}\end{array}\right.}$        $\overline{\left.\begin{array}{l}{\;}&{4.26}\\{\;}&{\;}\end{array}\right.}$

（3）12-5.8=6.2
$\left.\begin{array}{l}{\;}&{12}\\{-}&{5.8}\end{array}\right.$  验算$\left.\begin{array}{l}{\;}&{5.8}\\{+}&{6.2}\end{array}\right.$
$\overline{\left.\begin{array}{l}{\;}&{6.2}\\{\;}&{\;}\end{array}\right.}$      $\overline{\left.\begin{array}{l}{\;}&{12.0}\\{\;}&{\;}\end{array}\right.}$

点评 本题主要考查了学生小数加减的计算能力，在计算中要细心．