3000+400=,2 2,整百整千数的加减法,1. . 40+30= 62-40= 25+30= 32-8= 86-50= 56-38= 35+25= 7+15,2. . 85 ( ) ( ) . 300 ( ) . ( ) ( ) 64,整百整千数的加减法,1. . 2. . 3 .,整百整千数的加减法,1000,2000,1000,2000,10002000,1000,2000,10002000,1,2,3,3000,000,000,1,000,2,3,1000,2000,20001000,1000元,2000元,用加法计算,20001000,2,1,1,1000,20001000,000,000,2,000,1,1,. 80，50，130，360， 480，520，790，210， 630,1200,2600,4800,80 8,. 7 ( ) 6 ( ) 13 ( ) 24 ( ) 4 5 ( ) 5 6 8 (,8050,8 5 13 130,130,13050,80,1500,900,320 + 40,300,20,360,20 40 60 300 60 360,5 2
