Addition

123456
Across
  1. 2. 22 + 17
  2. 4. 15 + 10
  3. 5. 13 + 4
  4. 6. 18 + 7
Down
  1. 1. 19 + 20
  2. 3. 8 + 5
  3. 4. 12 + 15