MATHS

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Across
  1. 4. 90 degrees and 120 Degrees are part of what family
  2. 6. What is this +?
  3. 8. What is this -?
  4. 9. Something that's part of a hole
  5. 10. what do you call this format 1+1=2?
Down
  1. 1. What is this ÷?
  2. 2. The inside of a shape
  3. 3. What you use to calculate something fast
  4. 5. what this crossword is about
  5. 7. A shape with 3 sides