《2025年通城学典计算能手四年级数学下册青岛版》

一、口算

1.25×2 =
90÷100 =
1.4÷7 =
2.7 + 0.3 =
6.4÷0.4 =
20×5.5 =
16÷80 =
0.9÷0.001 =
680÷17 =
42 + 338 =
0.21×0.5 =
10 - 1.2 =
0.36×0.3 =
0.6÷0.2 =
1.8×0.02 =
100 - 35 =
15×600 =
400×1.5 =
11÷2.2 =
2.6 - 1.7 =
8.4÷7 =
0.8 + 1.02 =
0.93÷0.31 =
0.63÷0.09 =
100÷0.5 =
4.8×5 =
1.5×0.5 =
0.25×60 =
0.21×7 =
0.42÷0.3 =

答案： 2.5 0.9 0.23 16 1100.2 900 40380 0.105 8.80.108 3 0.03665 9000 6005 0.9 1.21.82 3 7200 24 0.7515 1.47 1.4

### 二、解方程

$3x÷5 = 4.8$
$1.5x + 18 = 3x$
$x - 2.6 + 4.5 = 8$

答案： x = 8 x = 12x = 6.1