Basic College Mathematics (10th Edition)

25.2$\div$0.56 = $\frac{252}{10}\div\frac{56}{100}$ (writing decimals as fractions) = $\frac{252}{10}\times\frac{100}{56}$ (division of fractions is multiplication by the reciprocal of the second fraction) = $\frac{28\times9}{1}\times\frac{10}{28\times2}$ = $\frac{90}{2}$ = 45