Answer:
28a 3/16 is the answer.
28b= 13/16
Explanation:
28a 1/8 + 1/16. 16 is the largest common denominator and to add those together 1/8 needs to have a denominator of 16 so multiply 2 to the numerator and denominator of 1/8 since in order to get a denominator of 16 you need to multiply 8×2 and what you do to the bottom you do to the top. 1/8 to 2/16. 2/16 + 1/16 = 3/16 is the answer.
28b 16/16 - 3/16 (answer from above) = 13/16