Hi!
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To start, let's add/subtract the fractions (by finding common denominators). Below them are your answers!
1) 1/2 (5/10) + 1/5 (2/10) = 7/10
1) Yes
2) 1/5 (2/10) - 1/10 (Same) = 1/10
2) No
3) 1/2 (5/10) + 2/5 (4/10) = 9/10
3) No
4) 4/5 (8/10) + 1/10 (Same) = 9/10
4) No
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Have a great day/night! :)
~pinetree