Tính nhẩm:a) 27 × 10 = …...; 72 × 100 =…...; 14 × 1000 =…...86 × 10 = …...; 103 × 10 =…...; 452 × 1000 =…...358 × 10 = …...; 1977 × 100 =…...; 300 × 1000 =…...b) 80 : 10 = …...; 400 : 100 =…... ;6000 : 1000 =…...300 : 10 = …...; 4000 : 100 =…... ;60000 : 1000 =…...2000 : 10 =…...; 40000 : 100 =…... ;600000 : 1000 =…...c) 64 × 10 =…...; 32 × 100 =…...; 95 × 1000 =…...640 : 10 =…...; 3200 : 100...
Đọc tiếp
Tính nhẩm:
a) 27 × 10 = …...; 72 × 100 =…...; 14 × 1000 =…...
86 × 10 = …...; 103 × 10 =…...; 452 × 1000 =…...
358 × 10 = …...; 1977 × 100 =…...; 300 × 1000 =…...
b) 80 : 10 = …...; 400 : 100 =…... ;6000 : 1000 =…...
300 : 10 = …...; 4000 : 100 =…... ;60000 : 1000 =…...
2000 : 10 =…...; 40000 : 100 =…... ;600000 : 1000 =…...
c) 64 × 10 =…...; 32 × 100 =…...; 95 × 1000 =…...
640 : 10 =…...; 3200 : 100 =…...; 95000 : 1000 =…...
a) 27 × 10 = 270; 72 × 100 = 7200; 14 × 1000 = 14000
86 × 10 = 860; 103 × 10 = 10300; 452 × 1000 = 452000
358 × 10 = 3580; 1977 × 100 = 197700; 300 × 1000 = 300000
b) 80 :10 = 8; 400 : 100 = 4 ;6000 : 1000 = 6
300 : 10 = 30; 4000 : 100 = 40 ; 60000 : 1000 = 60
2000 :10 = 200; 40000 :100 = 400 ;600000 : 1000 = 600
c) 64 × 10 = 640; 32 × 100 = 3200; 95 × 1000 = 95000
640 : 10 = 64; 3200 : 100 = 32; 95000 : 1000 = 95