#### Which ratio is larger 10 : 21 or 21 : 93?

LCM of 21 and 93 = 3 x 7 x 31=651

Make the denominator of each ratio equal to the 651.

$\\ \frac{10}{21}=\frac{10 \times 31}{21 \times 31}=\frac{310}{651} \\$

$\\ \frac{21}{93}=\frac{21 \times 7}{93 \times 7}=\frac{147}{651}$

Clear 10:21 is greater than 21:93.