Mathematics crossword

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Across
  1. 1. - 4 OPERATIONS TOGEATHER
  2. 4. - main thing in multiplying numbers
  3. 6. - a number which immediately comes after a number
  4. 7. - adding numbers
  5. 8. - last part of division
  6. 9. - 3d of a square
Down
  1. 2. - Double of Addition
  2. 3. - opposite of Addition
  3. 5. -one-dimensional measurement
  4. 6. -Equal Figures