全一卷
1.把3米长的绳子平均分成8段,每段长(________)米,3段占全长的(________)。
2.20÷25=
=24∶( )=( )%=( )(填小数)。

3.0.75∶2化成最简单整数比是__,比值是__。
4.72的37.5%是(________),(________)的20%是36吨。
5.科技小组用500粒玉米种子进行发芽试验,有15粒种子没有发芽,发率是(______)。
6.一个圆的半径是20厘米,则它的周长是(________)分米,面积是(________)平方分米。
7.一项工程,原计划10天完成,实际8天完成,那么工作时间缩短了
,工作效率提高了( )%。

8.把1.11,1.12,1.11%,
按从小到大的顺序排列是(__________)。

9.比的前项和后项同时乘或除以相同的数,比值不变。________
10.分母是100的分数都是百分数。(______ )
11.一个数乘分数的积一定比原来的数小,除以分数的商一定比原来的数大。( )
12.一台电视,连续两次降价10%后,现价相当于原价的81%。(______)
13.女生人数的
是男生人数,男生人数与女生人数的比是7∶8。(________)

14.
是运用了( )。

A.乘法交换律 | B.乘法分配律 | C.乘法结合律 |
15.两个圆的面积不相等,是因为它们的( )。
A.圆心的位置不同 | B.半径的长度不同 | C.圆周率大小不同 |
16.王叔叔种了99棵树,全部成活,这些树的成活率是( )。
A.99% | B.98% | C.100% |
17.两个圆的半径的比是1∶2,小圆的周长是大圆周长的( )%,小圆面积是大圆面积的( )%。
A.25,3.3 | B.25,50 | C.50,25 |
18.一个直三角形三个内角度数比不可能是( ).
A.1∶2∶3 | B.2∶3∶5 | C.2∶3∶4 |
19.直接写得数。
÷
= 1÷1%=
÷10%=
×
=
4÷
=
×
= 7÷
=
×6÷
=
×
=
×21=
÷
=
×
=





4÷













20.计算下面各题,能简算的要简算。
×
×
(
-
)÷
×
+
÷
725%×
+0.28×
×25%+
×2.2-0.25














21.解方程。
18+1205%x=30 x+
x=25
x÷
=24
18+1205%x=30 x+



22.计算下面图形的周长。


23.计算下图中阴影部分的面积。(单位:cm)


24.第二实验小学共有学生2400人,今天的出勤率为98.5%,今天有多少名学生没有出勤?
25.一种炸药用硝石、硫磺、木炭按3∶2∶4混合制成,一个采石场需72千克这种炸药,需要的木炭比硫磺多多少千克?
26.公园里有一个圆形花坛,直径是18米。在它的周围修一条1米宽的环形石子路。
(1)这条石子路的面积是多少平方米?
(2)沿环形石子路的外边缘每隔0.4米装一盏地灯,一共要装多少盏地灯?
(1)这条石子路的面积是多少平方米?
(2)沿环形石子路的外边缘每隔0.4米装一盏地灯,一共要装多少盏地灯?