沪教版二年级下册数学知识点总结
沪教版二年级下册数学知识点总结第一单元复习与提高一、计算1、加减乘除混合运算,先算乘除法,后算加减法。乘加、乘减,如3×2+2先算3×2再加2,17-2×3先算2×3,再用17减6;除加、除减,如2+6÷3先算6÷3,再加2,18÷2-3先算18÷2,再用9减3。2、有余数的除法,余数小于除数3、在□里填数,合适的数有多个,最大的数只有一个。7×□<30,合适的数0、1、2、3、4,最大的数4。二、分拆(分拆两位数)17×623×75×6+2×610×3-7×3=10×6+7×6=10×7+10×7+3×7=(5+2)×6=(10-7)×3=60+42=70+70+21=7×6=3×3=102...
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