Addition and Subtraction

123456
Across
  1. 2. 5231+3475
  2. 3. 2400+1089
  3. 4. 6585+2455
  4. 5. 3039-1805
  5. 6. 8754-6435
Down
  1. 1. 4539-3530
  2. 2. 6000+2913
  3. 5. 6379-4806