What is Like Denominators? Definition, Examples, Facts - SplashLearn Step 1: Since the denominators are different, we will find the LCM of 4 and 10. LCM (4, 10) = 20 Step 2: Multiply by suitable numbers. 1 × 5 4 × 5 = 5 20 2 × 2 10 × 2 = 2 20 The denominators are like denominators now. Compare Fractions with Like Denominators Comparing fractions with like denominators is quite easy.