Math time!

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Across
  1. 2. value some high some poor
  2. 4. i should sue them
  3. 6. ups and downs in life
  4. 7. used to eat on
  5. 8. i go up and down
  6. 9. the middle child
Down
  1. 1. x and y's no lies
  2. 3. something teenagers feel is useless
  3. 5. a repeat button's broken
  4. 8. vortex's sister
  5. 10. i make things big
  6. 11. seems like another language to some