When comparing fractions with the same denominator, you look at the numerators. The fraction with the larger numerator is greater.
When comparing fractions with the same numerator, you look at the denominators. The fraction with the smaller denominator is greater.
Yes, after understanding how different numerators and denominators affect fraction size using models, you can compare fractions without visuals by recalling that larger numerators result in larger fractions and larger denominators result in smaller fractions.