$$1\ +\ \frac{2}{5}=1\frac{2}{5}$$  

$$\frac{8}{12}=\frac{8:2}{4}$$  

$$\frac{5}{7}=\frac{5\times4}{7\times4}$$  

$$\frac{12\times3}{15\times5}$$  

$$\frac{12}{16}$$  

$$\frac{8}{12}$$  

$$\frac{3}{4}$$  

$$\frac{2}{3}$$  

$$\frac{49}{56}$$  

$$\frac{56}{49}$$  

$$\frac{42}{56}$$  

$$\frac{56}{42}$$  

48

42

24

28

25

30

60

300

$$6\frac{13}{21}$$  

$$6\frac{9}{10}$$  

$$7\frac{13}{20}$$  

$$5\frac{3}{10}$$  

$$2\frac{3}{18}$$  

$$1\frac{23}{36}$$  

$$1\frac{13}{36}$$  

$$2\frac{13}{36}$$