Answers (Fraction Addition/Subtraction)
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Question 1
      
Question 2
     
Question 3
      Prime factoring the denominators:
10 = 2 x 5,            25 = 5 x 5,              30 = 2 x 3 x 5
The LCD is: 2 x 3 x 5 x 5 = 150
Changing 1/10, 1/25, and 1/30 to equivalent fractions with 150 as the denominator:

15/150 + 6/150 + 5/150, and adding you get: 26/150.
Diagram shows 1/3 on top line and 4/9 on bottom line with 1/3 being added to it. Result is 7/9.
Diagram shows 1/3 on the top bar and 2/5 on the bottom bar. The 2/5 is shown addded to the top bar, obtaining 11/15 as the result.