Math crossword 4a

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Across
  1. 3. inches,centimeters,feet,yards
  2. 4. 37+1109= f
  3. 7. 4*6
  4. 8. how do you explain a equation with a Num-...
  5. 11. 90 degrees
  6. 13. 60 degrees
  7. 15. a story but with math
Down
  1. 1. 3-1
  2. 2. 180 degrees
  3. 5. 2+2
  4. 6. 130 degrees
  5. 9. how teach us math?
  6. 10. degrees?
  7. 12. math book
  8. 14. for what do you use the house In math?