专练三 阶段练习(4)-【AI•易错题】2025-2026学年新教材五年级数学下册口算练习（人教版）

10约分(1) $$\textcircled 1 \frac { 4 } { 1 5 } \textcircled 2 \frac { 7 } { 5 } \textcircled 3 \frac { 3 } { 4 } \textcircled 4 \frac { 2 } { 7 } \textcircled 5 \frac { 1 1 } { 1 6 } \textcircled 6 \frac { 7 } { 1 3 }$$ $$\textcircled 7 \frac { 9 } { 8 } \textcircled 8 \frac { 7 } { 2 5 }$$ $$\frac { 7 } { 2 5 } \textcircled 9$$ $$\textcircled 9 \frac { 2 } { 3 1 } \textcircled 1 0 \frac { 1 1 } { 1 9 }$$ $$\frac { 1 } { 9 } \textcircled 1$$ $$\textcircled 1 \frac { 8 } { 2 1 }$$ $$\frac { 3 } { 1 } \textcircled 2$$ $$\textcircled 2 \frac { 3 } { 4 }$$ $$\textcircled 1 3 \frac { 3 } { 1 0 }$$ $$\frac { 3 } { 1 0 }$$ $$\textcircled 1 4 \frac { 2 } { 5 } \textcircled 1 \frac { 1 1 } { 2 4 } \textcircled 6 \frac { 9 } { 1 1 } \textcircled 7 \frac { 3 } { 4 } \textcircled 8 \frac { 3 } { 2 }$$ $$\textcircled 1 \frac { 1 7 } { 1 4 }$$ $$\textcircled 2 \frac { 2 } { 5 }$$ $$\frac { 2 } { 5 } \textcircled 2 \frac { 2 } { 3 }$$ $$\textcircled 2 \frac { 4 } { 5 }$$ $$\textcircled 2 \frac { 4 } { 3 } \textcircled 2 \frac { 4 } { 1 1 }$$ $$\textcircled 2 5 \frac { 5 } { 8 }$$ $$\frac { 5 } { 8 } \textcircled 2$$ $$\frac { 3 } { 5 }$$ $$B \frac { 3 } { 2 }$$ $$\frac { 4 } { 5 }$$ $$2 \frac { 1 } { 2 }$$ $$\frac { 1 } { 2 } \textcircled 3 \frac { 9 } { 1 6 }$$ $$\textcircled 3 \frac { 3 } { 5 } \textcircled 3 \frac { 5 } { 4 }$$ 117约分(2) $$\textcircled 1 \frac { 1 } { 3 } \textcircled 2 \frac { 1 } { 1 1 }$$ $$\frac { 1 } { 1 1 } \textcircled 3 \frac { 2 } { 3 } \textcircled 4 \frac { 1 } { 5 } \textcircled 5 \frac { 1 } { 7 } \textcircled 6 \frac { 1 } { 3 } \textcircled 7 \frac { 1 } { 2 }$$ $$\textcircled 8 \frac { 2 } { 9 }$$ $$\frac { 2 } { 9 } \textcircled 9 \frac { 1 } { 1 2 }$$ $$\frac { 1 } { 2 } \textcircled 1 0 \frac { 1 } { 4 } \textcircled 1 \frac { 3 7 } { 3 9 }$$ $$\textcircled 1 \frac { 1 } { 3 }$$ $$\textcircled 1 3 \frac { 3 } { 5 } \textcircled 4 \frac { 1 } { 9 }$$ $$\textcircled 1 \frac { 1 } { 5 } \textcircled 1 6 \frac { 2 } { 5 } \textcircled 7 \frac { 1 } { 3 } \textcircled 8 \frac { 1 } { 2 } \textcircled 1 \frac { 4 } { 5 } \textcircled 2 \textcircled 2 \frac { 3 } { 4 } \textcircled 2 \frac { 2 } { 3 }$$ $$\textcircled 2 \frac { 3 } { 1 1 }$$ $$\textcircled 2 \frac { 3 } { 4 } \textcircled 2 \frac { 2 } { 3 } \textcircled 2 \frac { 1 } { 3 } \textcircled 2 \frac { 7 } { 2 3 }$$ $$\textcircled 2 7 \frac { 1 9 } { 2 3 } \textcircled 2 \frac { 4 } { 1 3 }$$ $$\textcircled 2 \frac { 7 } { 2 4 } \textcircled 3 \frac { 1 } { 2 } \textcircled 3 \frac { 5 } { 1 2 } \textcircled 3 \frac { 1 } { 4 }$$ 127约分(3) $$\textcircled 1 \frac { 8 } { 1 5 }$$ $$\frac { 8 } { 1 5 } \textcircled { 3 }$$ $$\textcircled 2 \frac { 1 1 } { 6 } \textcircled 3 \frac { 1 } { 6 } \textcircled 4 \frac { 1 } { 3 } \textcircled 5 \frac { 2 } { 3 } \textcircled 6 \frac { 4 } { 5 } \textcircled 7 \frac { 4 } { 3 }$$ $$\textcircled 8 \frac { 1 } { 4 } \textcircled 9 \frac { 1 } { 3 } \textcircled 1 \frac { 1 3 } { 5 } \textcircled 1 \frac { 3 } { 2 }$$ $$\textcircled 1 2 \frac { 5 } { 2 } \textcircled 3 \frac { 2 } { 3 } \textcircled 1 \frac { 1 } { 3 }$$ $$\textcircled 1 \frac { 4 } { 7 } \textcircled 1 6 \frac { 3 } { 5 } \textcircled 7 \frac { 5 } { 6 } \textcircled 8 \frac { 4 } { 5 } \textcircled 9 \frac { 3 } { 5 }$$ $$\frac { 3 } { 5 } \textcircled { 2 0 }$$ $$\textcircled 1 \frac { 3 } { 4 } \textcircled 2 \frac { 2 } { 7 }$$ $$\textcircled 2 \frac { 8 } { 3 } \textcircled 2 \frac { 1 3 } { 6 }$$ $$\frac { 3 } { 6 } \textcircled { 2 4 }$$ $$\textcircled 4 \frac { 5 } { 4 }$$ $$\frac { 7 } { 2 }$$ $$\textcircled 2 6 \frac { 3 } { 4 0 }$$ $$\textcircled 2 \frac { 9 } { 8 } \textcircled 2 \frac { 1 1 } { 1 2 }$$ $$\textcircled 2 9 \frac { 4 } { 3 } \textcircled 3 \frac { 9 } { 4 } \textcircled 3 \frac { 1 8 } { 1 1 }$$ $$\textcircled 3 \frac { 1 5 } { 2 }$$ 参考答案 阶段练习（4) 1,2, 5,10, 9,18 3,6 15,30 4,9,12,1,2, 7,14, 18,36 3,6 21,42 2.①9②10 ③18④8 ⑤6⑥4⑦4 ⑧8⑨10⑩3 ①19②11③3④14 ⑤4⑥8 ⑦11⑧2 31)0斜 @ ③18 ④ 8 24 ⑤10 024 ⑥18 ⑦16 ⑧27 24 4 024 (2)@器②老 ③ @活 号 ⑤ ⑦ 16 6 4.① @ ®片 ④ 3 ⑦ 国片 ②1 国3 4 ⑦}⑧13 8 4 ®9 21 巧11 团23 4 39 @j 4 智慧乐园 小猫和小羊、小鸡和小鸭、刺猬和狐狸。 器》 0 别 3最小公倍数 ①60②225③24④45⑤48⑥48 ⑦96⑧24⑨105⑩35①130②84 57口算 五年级 下册 阶段练习(4) 1.把每组数的因数、公因数分别填在相应的位置，并圈出它们的最大公因数。 18的因数 30的因数 36的因数 42的因数 18和30的公因数 36和42的公因数 2.写出下面每组数的最大公因数。 ①27和36() ②50和60() ③18和36() ④40和16( ⑤36和30() ⑥16和52( ) ⑦52和24( ⑧16和24( ⑨140和50( ⑩48和15( ①19和57() ②33和77（ ) ③18和21() ④56和42() ⑤32和44() ⑥16和56() ⑦44和121（) ⑧18和52() 3.按要求做题。 （1)把下面的分数化成分母是24而大小不变的分数。 ② ③ 6 () ④9=() 12 ⑤ 25=() 601 ⑥36=() ⑦ ⑧ 48 (2)把下面的分数化成分母是16而大小不变的分数。 ① ②1=() ③ ④ 8 4 32 =() ⑤ 48=(） 64 0-(） ⑦ 45-(） ⑧ 8 36=(） 9 30 专练三分数的意义和性质 4.把下面各分数化成最简分数。 $$\textcircled 1 \frac { 9 9 } { 7 5 } = \left($$ () $$\textcircled 2 \frac { 1 7 } { 5 1 } = \left($$ ) $$\textcircled 3 \frac { 1 2 } { 9 } = \left($$ () $$\textcircled 4 \frac { 5 } { 1 1 5 } = \left($$ ) $$\textcircled 5 \frac { 3 2 } { 4 0 } =$$ ( ) $$\textcircled 6 \frac { 2 0 } { 3 2 } =$$ =() $$\textcircled 7 \frac { 8 1 } { 8 7 } = \left($$ ( ) $$\textcircled 8 \frac { 6 0 } { 9 0 } =$$ ) $$\textcircled 9 \frac { 4 } { 1 2 } =$$ ( ) $$\textcircled 1 \frac { 2 0 } { 1 5 } =$$ () $$\textcircled 1 \frac { 3 0 } { 1 8 } =$$ ( ) $$\textcircled 1 2 \frac { 1 2 } { 2 4 } =$$ () $$\textcircled 1 3 \frac { 4 2 } { 5 6 } = \left( \right)$$ $$\textcircled 4 \frac { 6 } { 3 0 } =$$ =() $$\textcircled 1 \frac { 4 } { 3 2 } = \left( \right)$$ $$\textcircled 1 \frac { 1 6 } { 8 0 } =$$ =( ) $$\textcircled 1 \frac { 1 0 } { 8 0 } =$$ () $$\textcircled 1 8 \frac { 9 1 } { 2 8 } =$$ =( ) $$\textcircled 1 9 \frac { 2 8 } { 2 1 } =$$ () $$\textcircled 2 0 \frac { 3 6 } { 1 6 } =$$ () $$\textcircled 2 \frac { 8 4 } { 9 6 } =$$ ( ) $$\textcircled 2 2 \frac { 9 } { 7 2 } =$$ =( ) $$\textcircled 2 3 \frac { 5 5 } { 1 5 } =$$ ( ) $$\textcircled 2 4 \frac { 3 2 } { 2 4 } =$$ () $$\textcircled 2 5 \frac { 3 3 } { 1 2 } =$$ $$\textcircled 2 6 \frac { 4 6 } { 7 8 } =$$ =( $$\textcircled 2 7 \frac { 3 3 } { 6 6 } = \left( \right)$$ $$\textcircled 2 8 \frac { 1 6 } { 2 0 } =$$ () 智慧乐园 下面哪些小动物在直线上的同一个位置?请在直线上分别标出它们身上的数对应的 位置。 34 $$\frac { 3 4 } { 5 1 }$$ $$\frac { 9 } { 1 2 }$$ $$\frac { 1 8 } { 3 6 }$$ 3 0 1 31