《2025年课堂点睛五年级数学上册人教版湖北专版》

一 找规律,填一填。
1. $1÷9 = 0.\dot{1}$ $2÷9 = 0.\dot{2}$
$3÷9 = 0.\dot{3}$ $4÷9 = $0.$\dot{4}$
$5÷9 = $0.$\dot{5}$ $6÷9 = $0.$\dot{6}$
我发现它们的商的规律是：商都是无限循环小数,且循环节是被除数。
2. $4×6 = 24$
$3.4×6.6 = 22.44$
$3.34×66.6 = 222.444$
$3.334×666.6 = $2222.4444
$3.3334×6666.6 = $22222.44444
3. $12÷4 = 3$
$1122÷34 = 33$
$111222÷334 = 333$
$11112222÷3334 = $3333
$1111122222÷33334 = $33333
$111111222222÷333334 = $333333
4. $23×1.1 = $25.3 $234×1.1 = $257.4
$35×1.1 = $38.5 $413×1.1 = $454.3
$43×1.1 = $47.3 $526×1.1 = $578.6

答案： 1.0.$\dot{4}$ 0.$\dot{5}$ 0.$\dot{6}$ 商都是无限循环小数,且循环节是被除数 2.2222.4444 22222.44444 3.33333 333333 4.25.3 257.4 2 5 3 2 5 7 4 38.5 454.3 47.3 578.6

二 用计算器计算前三题,找出规律,直接写出后三题的得数。
1. $1÷11 = $0.$\dot{0}\dot{9}$
$2÷11 = $0.$\dot{1}\dot{8}$
$3÷11 = $0.$\dot{2}\dot{7}$
$4÷11 = $0.$\dot{3}\dot{6}$
$5÷11 = $0.$\dot{4}\dot{5}$
$6÷11 = $0.$\dot{5}\dot{4}$
2. $99.99×0.2 = $19.998
$99.99×0.3 = $29.997
$99.99×0.4 = $39.996
$99.99×0.5 = $49.995
$99.99×0.6 = $59.994
$99.99×0.7 = $69.993

答案： 1.0.$\dot{0}\dot{9}$ 0.$\dot{1}\dot{8}$ 0.$\dot{2}\dot{7}$ 0.$\dot{3}\dot{6}$ 0.$\dot{4}\dot{5}$ 0.$\dot{5}\dot{4}$ 2.19.998 29.997 39.996 49.995 59.994 69.993

三 用计算器计算下面各题,再根据你的发现填一填。
$9.8×0.9 + 1.68 = $10.5
$98.7×0.9 + 11.67 = $100.5
$987.6×0.9 + 111.66 = $1000.5
9876.5$×0.9 +$1111.65$=$10000.5
98765.4$×0.9 +$11111.64$=$100000.5
987654.3$×0.9 +$111111.63$=$1000000.5

答案： 10.5 100.5 1000.5 9876.5 1111.65 10000.5 98765.4 11111.64 100000.5 987654.3 111111.63 1000000.5

四 先找出规律,再按规律填数。
1. $42$ $39$ $36$ 33 $30$ 27 $24$
2. $4$ $1.6$ $0.64$ 0.256 0.1024
3. $1.5$ $0.75$ $0.375$ 0.1875 0.09375

答案： 1.33 27 2.0.256 0.1024 3.0.1875 0.09375

五 找规律,填一填。

11 16.5 22 27.5 13.2 19.8 26.4 33 39.6

答案： 11 16.5 22 27.5 13.2 19.8 26.4 33 39.6