Maths Corner

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123456
Across
  1. 3. take a letter from me and I become an even number.
  2. 4. shape of a ball.
  3. 5. repeated addition.
  4. 6. part of a whole.
Down
  1. 1. repeated subtraction.
  2. 2. I look like an egg.
  3. 3. quadrilateral with all sides and angles equal.