《2025年阳光同学计算小达人四年级数学下册人教版》

1. 口算。（建议2分钟完成）
$6.7 + 3.6 =$ $9.9 - 5.8 =$ $0.45 + 0.27 =$ $0.54 + 0.16 =$
$8.1 - 4.3 =$ $2.7 + 6.4 =$ $0.92 - 0.51 =$ $0.71 - 0.21 =$
$5.8 - 2.5 =$ $1.7 + 6.3 =$ $0.88 - 0.49 =$ $2.3 + 7.54 =$

答案： 10.3@@4.1@@0.72@@0.7@@3.8@@9.1@@0.41@@0.5@@3.3@@8@@0.39@@9.84

2. 用竖式计算。（建议6分钟完成）
$64 - 0.82 =$ $3.49 + 51.5 =$ $19.4 - 2.58 =$
$15.62 - 0.97 =$ $6.7 + 8.32 =$ $4.1 - 1.23 =$
$29.19 + 14 =$ $25 - 18.54 =$ $78.49 + 11.5 =$

答案： 63.18@@54.99@@16.82@@14.65@@15.02@@2.87@@43.19@@6.46@@89.99

在$\square$里填上合适的数字，使竖式成立。
$\begin{array}{r}7.\square\\+\square.5\\\hline16.2\end{array}$ $\begin{array}{r}6.\square\\-\square.56\\\hline2.4\square\end{array}$ $\begin{array}{r}\square\square.4\\-8.7\square\\\hline17.\square7\end{array}$

答案：