# Posts by tayloir

Total # Posts: 2

**math**

I do not undeerstand this question for homework. Determine if the set is closed for the given operation. 1. yes or no- The set of positive fractions for division. 2. yes or no=The set of positive integers for subtraction. Can someone help me?

**lcm**

find the least common mutlipe of 420 196 Break down each number into prime number factors 196 = 2*2*7*7 420 = 70*2*3 = 2*2*3*5*7 The least common multiple is the product of all prime factors that occur in both numbers 2*2*3*5*7*7 = 2940