《2025年通城学典计算能手四年级数学下册青岛版》

一、口算。（每题1分，共30分）
0.24×0.8= 820 - 280 = 3.65 + 1.2 + 0.35 =
0.8÷0.1 = 7.4×5 = 21÷2÷0.5 =
8.4 - 0.84 = 1÷0.8 = 16 - 0.16 - 0.84 =
0.16×5 = 0.9 - 0.12 = 9×0.25×0.4 =
4.2÷0.14 = 24×50 = 3.12×9 + 3.12 =
99 + 1.1 = 3÷50 = 1.08 -（0.08 + 0.5）=
0.16×0.6 = 3.2 - 2 = 15÷1.5 - 7.82 =
0.16÷0.8 = 2.3×0.3 = （3.8 - 3.8）÷12.5 =
4.4 + 4.6 = 17÷5 = 7 - 4×1.5 =
12 - 1.2 = 0.13×0.5 = 1.25×8÷4 =

答案： 0.192 540 5.2
8 37 21
7.56 1.25 15
0.8 0.78 0.9
30 1200 31.2
100.1 0.06 0.5
0.096 1.2 2.18
0.2 0.69 0
9 3.4 1
10.8 0.065 2.5

二、解方程。（每题3分，共27分）
5x + 6.32 = 8.72 6.4x - 3.2x = 2.56 0.7(x + 0.48) = 0.49
3.2x - 8 = 10.4 23×0.2 + 1.7x = 8 0.5x - 6.4 - 2.6 = 3.2
7x÷3 = 8.19____ 2.2x - 0.5×2 = 10 x - 12.5 + 8.5 = 11

答案： x = 0.48 x = 0.8
x = 0.22
x = 5.75 x = 2
x = 24.4
x = 3.51 x = 5
x = 15

三、计算下面各题，怎样简便就怎样计算。（前两题每题2分，其余每题3分，共43分）
307×99.9 48.4 + 2.7 + 51.6 - 0.4 （62.9÷3.7 - 7.8）×3.5
6.5×1.4 - 24.96÷7.8 100÷32÷0.25÷1.25 26.7 - 15.5÷6.2 - 7.5
5.8×8.9 + 11×0.58 （15 + 5.4）÷0.24 - 49 9.05 - 7.36÷（2.3×4）
28.6×10.1 - 2.86 46.7 -（6.7 + 49÷5） 36÷[（17.5 + 1.22）÷26]
18÷0.18÷4 - 5.9 （6.4 + 4.38÷0.73）×3.4 8.5×[3.64÷（7.1 - 1.9）]

答案： 30669.3 102.3 32.2
5.9 10 16.7
58 36 8.25
286 30.2 50
19.1 42.16 5.95