Scale the numerator and the denominator up by a factor of 11 (multiply) to write a fraction equivalent to start fraction 5/9

Since we want to scale the numerator and denominator by a factor of 11, we multiply both the numerator and denominator by 11:

5 * 11 = 55
9 * 11 = 99

Therefore, the fraction equivalent to start fraction 5/9 when scaled up by a factor of 11 is 55/99.