18-4
17-5
11+6=17 6+11=17
17-6=11
6+4=( 10)+8=( 18)-7=( 11)+5=( 16)-4=(12)+6= 18 19-9=(10)+7=(17 )-5=(12 )+6=(18 )-4大版一年级数学上册
20以内 不进位加法与不退位减法
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1. 理解并掌握20以内不进位加法和不退 位减法的计算方法。 2. 初步感悟加减法之间的联系,初步了 解加减法各部分的名称。
5+4 10+4
7+3 10+5