Add and Subtract the Fractions!

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123456
Across
  1. 2. 6/15 - 4/15 =
  2. 3. 20/40 - 200/4000 =
  3. 5. 1/2 + 1/2 =
  4. 6. 6 1/2 + 4
Down
  1. 1. 7 5/8 - 4 2/8 =
  2. 4. 5 1/2 + 1 1/2 =