一年级数学下册第2单元《20以内的退位减法》同步精练新人教版.doc

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1、120 以内的退位减法一、 填空题。1. 15-9=( ) 想: 9 加( )等于 15, 15 减 9 等于( )。 2. 12-8=( ) 想: 8 加( )等于 12, 12 减 8 等于( ) 。 38+( )=12 6+( )=14 8+( )=15 9+( )=16 二、 口算题。11-9= 15-7 = 12-8 = 14-6= 18-9= 14-10=11-6= 13-8= 15-9= 18-7= 16-9= 12-9=14-7= 18-8= 13-9= 14-9= 17-7= 17-8= 三、算一算,比一比,在( )里填上“” 或 “=”。11 - 8( )4 13- 8(

2、6-2 15- 7( )9+1 14 -9( )5 12-7( )4+2 5+3( )13-716 -7( )5+4 12-9( )4-2 5+ 9( )18-6 四、 解决问题。1、圈一圈,算一算。 2、个13 个3、一本书有 18 页, 方方看了 9 几页没看? = 4、小华做了 15 朵花, 送给幼儿园 8 朵, 他还有几朵? = ?元15元8元6个 25、 要送 13 份礼物,现在剩下 6 份,送了几份? = 6、小红( )岁 小明( )岁参考答案一、1.6 6 62.4 4 43.4 8 7 7二、2 8 4 8 9 45 5 6 11 7 37 10 4 5 10 9三、= 3四、1.8 52.6+7=13 7+8=15 3.18-9=94.15-8=75.13-6=76小红 10 岁,小明 7 岁或小红 9 岁,小明 8 岁解析:1、本题考查 20 以内减法。 2、本题考查 20 以内减法,用加法的形式考查减法运算。3、本题考查 20 以内减法。4、本题考查 20 以内减法。5、本题考查 20 以内减法。6、本题是一个思考题,两人都大于六岁,小红比小明大,两人的和又是 17 岁。所以小明 7 岁,小红 10 岁 17-7=10 小明 8 岁,小红 9 岁 17-8=9小明 9 岁 小红 8 岁 不符合题意。

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