a) Đặt tính rồi tính:

21530 – 1709

9,197 – 2,537

45,8 – 37,74

b) Tính:

$\frac{4}{3} - \frac{5}{9}$  

$\frac{2}{3} - \frac{2}{7}$    

$2\frac{3}{5} - \frac{4}{{10}}$

a) Đặt tính rồi tính

5623 x 545                                            

71,9 x 5                                            

21,8 x 0,65

b) Tính:

$\frac{5}{7} \times \frac{{21}}{{25}}$                                

$\frac{{15}}{{75}} \times \frac{{40}}{{72}}$                             

$2\frac{1}{4} \times 3\frac{7}{3}$

Tính:

a) 12,3 : 10  = ..................................                     

24,6 : 100 = .................................                     

35,7 : 1000 = ...............................                     

1,23  :   0,1  = ..............................

2,46  :  0,01  = .............................

3,57  :  0,001 = ............................

b) 41  :  0,25  = ................................                     

41  x  4      = ................................                     

85   :   0,5  = ................................

85   x   2    =  ...............................

a) Đặt tính rồi tính:

1620 : 12                             

592,8 :  13                                     

125,8  :  1,25

b) Tính:

$\frac{4}{9}$: $\frac{{16}}{{27}}$                                   

$\frac{{18}}{{81}}$ : $\frac{{150}}{{135}}$                                  

$3\frac{5}{6}$ : $2\frac{2}{3}$