This the method on how I would work it out:

First, convert both fraction's denominator to their LCM. Convert the LCM of 16 and 18:

Formula a*b/gcd(a,b) (The GCD of 16 and 18 is 2)

16 * 18/2 = 288/2 = 144

144 / 16 = 9

144 / 18 = 8

3/16 * 9/9 = 27/144

1/18 * 8/8 = 8/144

27/144 - 8/144 = 19/14

Final Answer: 3/16 - 1/18 = 19/144

First, convert both fraction's denominator to their LCM. Convert the LCM of 16 and 18:

Formula a*b/gcd(a,b) (The GCD of 16 and 18 is 2)

16 * 18/2 = 288/2 = 144

144 / 16 = 9

144 / 18 = 8

3/16 * 9/9 = 27/144

1/18 * 8/8 = 8/144

27/144 - 8/144 = 19/14

Final Answer: 3/16 - 1/18 = 19/144