Mathematic puzzle

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Across
  1. 1. things that make up the world
  2. 2. +
  3. 5. the perimeter of shapes
  4. 6. ×
  5. 8. triangles and others
  6. 10. 1-10
  7. 12. It is used for high levels of math for kids
Down
  1. 1. -
  2. 3. ÷
  3. 4. some thing used in drawing and math
  4. 5. 90°,1°180°
  5. 7. ½,¼,¹⅓
  6. 8. 2,4,6,8,10
  7. 9. the point of 1.00
  8. 11. the topic