To find a rational number equivalent to 5/7, we can multiply both the numerator and the denominator by the same non-zero integer. For example, if we multiply both by 2, we get:
5 x 2 / 7 x 2 = 10 / 14
Thus, 10/14 is an equivalent rational number to 5/7. We can choose any integer to multiply by, so you could also use 3, 4, or any other number, to find more equivalent fractions like 15/21 or 20/28. In essence, equivalent fractions are simply different ways of expressing the same value.