How can you use number patterns to find the least common multiple of 120 and 360

Keisha makes a large sandwich for a family picnic she takes 1/2 of them the sandwich to the picnic her family eats 3/8 of the whole sandwich what fraction of the whole sandwich does keisha bring back from the picnic

Write the percent as a fraction or mixed number in simplest form. 0.8%

20 ! brainliest ! add and simplify your answer.