沪教数学四年级第一学期计算复习ppt课件.ppt

计算（复习）,口算,363=1258=7060=50025=2000-99=,250-75=4623=963=1230=254=,36012=800040=167=847=4570=,12,1000,4200,20,1901,175,2,32,360,100,30,200,112,12,3150,+110=400,=400-110,=290,-220=100,=220+100,=320,950-=160,=950-160,=790,一个加数和 另一个加数,被减数=差+减数 减数=被减数-差,一个加数=和-另一个加数减数=被减数-差被减数=差+减数,334+=879564-=67-485=789,13=390,=39013,=30,一个因数=积 另一个因数,复习与提高,735=7,=7357=105,7=18,=187=126,被除数=商 除数,除数=被除数 商,一个因数=积另一个因数除数=被除数商被除数=商除数,28=78429=761008=28,递等式计算，能巧算的要巧算12564255 25+75510001258567+235-1677929-29291250550,9924+24101252327+2777257+245+443+355,分数加减法,9,4,9,1,9,5,9,4,1,7,9,2,-,=,9,7-2,9,=,9,5,相同分母的分数相加减，分母不变，分子相加减。,算一算,3,7,+,2,7,19,19,9,8,9,5,7,+,+,9,=,=,=,=,20,20,10,+,10,=,=,=,=,17,18,18,8,20,20,11,14,1,19,3,19,7,30,14,-,-,-,-,5,7,17,19,12,9,20,20,=1,9,18,3,20,4,19,16,30,试一试,2,18,+,8,18,17,17,2,13,8,17,+,-,=,=,20,+,=,=,14,21,21,8,20,12,1,2,-,-,18,5,+,21,-,3,