<div style="text-align: center;"><strong><font color="#ff0000">三年级数学小数的初步认识练习</font></strong></div><div><br><span><strong>一、口算。</strong></span></div><div><span><br></span><span>1.8+1.2= 3.9-1.8= 5.6+0.3= 4+0.4= 0.7+0.8= 2.2-0.2=</span><span><br></span><span>2.7-2.5= 3-0.8= 0.8-0.4= 5.7-0.5= 10.1+1.3= 2.5+2.5=</span><span><br></span><span><br></span></div><div><span><strong>二、填空。</strong></span></div><div><span><strong><br></strong></span><span>1. 一位小数表示十分之几,两位小数表示( ),三位小数表示( )。</span><span><br></span><span>2. 小数点的( )边是整数部分,( )边是小数部分。</span><span><br></span><span>3. 在小数中相邻的两个计数单位的进率都是( )。</span><span><br></span><span>4. 12.10020读作( )</span><span><br></span><span>5. 0.4里有( )个十分之一,有( )个百分之一。</span><span><br></span><span>6. 5个百分之一是( ),9个千分之一是( )。</span><span><br></span><span>7. ( )个0.1是1,( )个0.01是1。</span><span><br></span><span>8. 0.3的计数单位是( ),如果它以百分之一为计数单位,写出来的数是( )。</span><span><br></span><span>9. 3.78是由3个( ),7个( )和8个( )组成的。</span><span><br></span><span>10. 207个百分之一组成的数是( ) </span><span><br></span><span> 十二点零五写作( ),0.065读作( )。</span><span><br></span><span>6个0.1是( ),1.9里有( )个0.1,34个0.01是( )。</span><span><br></span><span>1角5分=( ) 元 2米2厘米=( )米</span><span><br></span><span>1.53元=( )分 0.98米=( )厘米</span><span><br></span><span>14. 7个百分之一写成小数是( )。</span><span><br></span><span>15. 5角4分写成分数是( )元,写成小数是( )元。</span><span><br></span><span>16. 小丽高1.40米,爸爸高17分米,爸爸比小丽高( )分米。</span><span><br></span><span>17. 0.5米表示把( )平均分成( )份,取其中的( )份。</span><span><br></span><span>18. 按从小到大的顺序排序:</span><span><br></span><span> 0.068、0.68、0.806、0.608、0.680_____________________________________________________</span><span><br></span><span>19. 填入适当的小数:</span><span><br></span><span>1 < ( ) < ( ) < ( ) < ( ) < 1.5</span><br><br><span><strong>三 、练一练。 </strong></span></div><div><span><br></span><span>1米=( )分米 1分米=( )米 1分米=( )厘米 1厘米=( )分米</span><span><br></span><span>1米=( )厘米 1厘米=( )米1千克=( )克 1克=( )千克</span><span><br></span><span>4 分米 = ( )米; 6 厘米 = ( )米; 65 克 = ( )千克; </span><span><br></span><span>340 克 = ( )千克; 3 角 5 分 = ( )元; 1 米 4 厘米 = ( )米 </span><span><br></span><span> 69克=( )千克 1 米5分米=( ) 分=( )元 </span><br><br><span> 1千克50克=( )千克 15平方厘米=( )平方米</span><br><br><span><strong>四、比较大小。</strong></span></div><div><span><br></span><span>0.75 ○ 0.8 5.69 ○ 56.9 7.217 ○ 7.22 </span><span><br></span><span><br></span></div><div><span>6.04 ○ 6.004 0 .9 ○0.839 3.50 ○ 3.6 </span><br><br><span><strong>五、选择填空。</strong></span></div><div><span><br></span><span>1.百米赛跑中,小明的成绩是15.6秒,小刚的成绩是16.1秒,小军的成绩比小刚好,比小明差,小军的成绩可能是( )秒。</span><span><br></span><span><br></span></div><div><span>A.14.5 B.17.5 C.16</span><span><br></span><span><br></span></div><div><span>2.比1大比1.5小的小数有( )个。</span><span><br></span><span><br></span></div><div><span>A.100 B.1000 C.无数个</span></div><div><span><br></span><span><strong>六、竖式计算。</strong></span></div><div><span><br></span><span>2.3+13.9 10.8-7.9 8+7.8</span><span><br></span><span>65.5-6.9</span><span><br></span><span><br></span></div><div><span><strong>七、解决问题。</strong></span></div><div><span><strong><br></strong></span><span>1.小华身高1.5米,比小芳矮0.3米,小芳身高多少米?</span><span><br></span><br><span>2.小华身高1.5米,小芳比小华矮0.3米,小芳身高多少米?</span><span><br></span><br><span>3.地上有一桶水,连桶带水一共重15.3千克,倒掉半桶后,还剩8.3千克,桶和各种多少千克? </span><span><br></span> <br><span><strong>附加题:按从小到大的顺序排列下面的数。</strong></span></div><div><span><br></span><span> (1) 0.720 , 0.702 , 0.712 (2) 8.09 , 8.91 9.08 (3) 3.87、4.53、3.45、3.78、4.53 </span><span><br></span><span> ( )<( )<( ) ( )<( )<( ) ( )<( )<( )<( )<( )</span><br></div><div><span><br></span></div><div><span><br></span></div>
三年级下