Bài 1
a) $\dfrac{7}{10}$ = 0,7
$\dfrac{9}{100}$ = 0,09
$\dfrac{13}{1000}$ = 0,013
b) $\dfrac{3}{4}$ = $\dfrac{75}{100}$ = 0,75
$\dfrac{4}{5}$ = $\dfrac{8}{10}$ = 0,8
$\dfrac{5}{8}$ = $\dfrac{625}{1000}$ = 0,625
c) 1$\dfrac{1}{4}$ = $\dfrac{5}{4}$ = $\dfrac{125}{100}$ = 1,25
1$\dfrac{7}{8}$ = $\dfrac{15}{8}$ = $\dfrac{1875}{1000}$ = 1,875
d) $\dfrac{75}{12}$ = $\dfrac{25}{4}$ = $\dfrac{625}{100}$ = 6,25
$\dfrac{48}{25}$ = $\dfrac{192}{100}$ = 1,92
Bài 3:
a) 0,72 = 0,72 x 100% = 72%
0,103 = 0,103 x 100% = 10,3%
0,035 = 0,035 x 100% = 3,5%
0,8 = 0,8 x 100% = 80%
1,03 = 1,03 x 100% = 103%
3,5 = 3,5 x 100% = 350%
b) 37% = 37 : 100 = 0,37
4,8% = 4,8 : 100 = 0,048
123% = 123 : 100 = 1,23
3,7% = 3,7 : 100 = 0,037
4,08% = 4,08 : 100 = 0,0408
305% = 305 : 100 = 3,05
