shun sounding words

12345678
Across
  1. 4. calculation example 3x6
  2. 5. final summary
  3. 7. inverse operation of times
  4. 8. plus in maths
Down
  1. 1. workings for a maths story
  2. 2. a blast or big bang
  3. 3. the process of taking away
  4. 6. stopping place for a train
  5. 7. making up your mind