Question

what should be added to 5 whole 1/4 to get 3 whole 1/8

Answer 1

$Let \: \: the \: \: required \: \: number \: \: be \: \: y$

Then,

$5\frac{1}{4} + y = 3\frac{1}{8} \\ \\ \\ y = 3\frac{1}{8} - 5 \frac{1}{4} \\ \\ y = \frac{25}{8} - \frac{21}{4} \\ \\ y = \frac{25 - 42}{8} \\ \\ y = \frac{ - 17}{8} \\ \\ y = - 2 \frac{1}{8}$