3/10 = [tex]\frac{3}{10}[/tex] * 100% = 30%
0,15 = 0,15 * 100% = 15%
2 1/4 = [tex]\frac{9}{4}[/tex] * 100% = ([tex]\frac{9}{4}[/tex] * [tex]\frac{25}{25}[/tex]) * 100% = [tex]\frac{225}{100}[/tex] * 100% = 225%
12/15 = [tex]\frac{12}{15}[/tex] * 100% = ([tex]\frac{12}{15}[/tex] : [tex]\frac{3}{3}[/tex]) * 100% = [tex]\frac{4}{5}[/tex] * 100% = [tex]\frac{8}{10}[/tex] * 100% = 80%
