a)
[tex]12 + 6 = 18 \\ \\ 12 - 8 = 4[/tex]
b)
[tex]18 - 12 = 6 \\ \\ 2 \times 12 = 24[/tex]
c)
[tex]12 \div 4 = 3 \\ \\ 48 \div 12 = 4[/tex]
d)
[tex] \frac{1}{2} \times 12 = 6 \\ \\ 4 \frac{4}{5} \div 12 = \frac{ \not24_2}{5} \times \frac{1}{ \not12_1} = \frac{2}{5} = 0.4[/tex]
