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6)
$16\frac{3}{13}-6\frac{8}{13}=15\frac{3}{13}+\frac{13}{13}-6\frac{8}{13}=15\frac{16}{13}-6\frac{8}{13}=9\frac{8}{13}$
7)
$13\frac{4}{9}-2\frac{8}{9}=12\frac{4}{9}+\frac{9}{9}-2\frac{8}{9}=12\frac{13}{9}-2\frac{8}{9}=10\frac{5}{9}$

8)
$10\frac{7}{16}-4\frac{12}{16}=9\frac{7}{16}+\frac{16}{16}-4\frac{12}{16}=9\frac{23}{16}-4\frac{12}{16}=5\frac{11}{16}$

9)
$29\frac{49}{53}-8\frac{49}{43}=21\frac{0}{43}=21$

10)
$(20\frac{16}{25}+13\frac{9}{25})-(23\frac{4}{14}+7\frac{13}{14})$
$33\frac{25}{25}-30\frac{17}{14}$
$33+\frac{25}{25}-30\frac{17}{14}$
$33+1-30\frac{17}{14}$
$34-\frac{437}{14}=\frac{34}{1}-\frac{437}{14}=\frac{476}{14}-\frac{437}{14}=\frac{39}{14}=2\frac{11}{14}$